Exhibit 4.4

                                                               Execution Version

================================================================================


                         SBA COMMUNICATIONS CORPORATION

                                    as Issuer

                                       and

                                ----------------

                       STATE STREET BANK AND TRUST COMPANY

                                   as Trustee

                                ----------------

                                    INDENTURE

                          Dated as of February 2, 2001

                               up to $500,000,000

                     10 1/4% Senior Notes due 2009, Series A

                     10 1/4% Senior Notes due 2009, Series B

================================================================================


                            CROSS-REFERENCING TABLE*


Trust Indenture
Act Section                                              Indenture Section
- -----------                                              -----------------

310(a)(1).............................................                   7.10
   (a)(2).............................................                   7.10
   (a)(3).............................................                   N.A.
   (a)(4).............................................                   N.A.
   (a)(5).............................................                   7.10
   (b)................................................                   7.10
   (c)................................................                   N.A.
311(a)................................................                   7.11
   (b)................................................                   7.11
   (c)................................................                   N.A.
312(a)................................................                   2.05
   (b)................................................                  11.03
   (c)................................................                  11.03
313(a)................................................                   7.06
   (b)(1).............................................                  10.03
   (b)(2).............................................                   7.07
   (c)................................................            7.06, 11.02
   (d)................................................                   7.06
314(a)................................................            4.03, 11.02
   (b)................................................                  10.02
   (c)(1).............................................                  11.04
   (c)(2).............................................                  11.04
   (c)(3).............................................                   N.A.
   (d)................................................    10.03, 10.04, 10.05
   (e)................................................                  11.05
   (f)................................................                   N.A.
315(a)................................................                   7.01
   (b)................................................            7.05, 11.02
   (c)................................................                   7.01
   (d)................................................                   7.01
   (e)................................................                   6.11
316(a) (last sentence)................................                   2.09
   (a)(1)(A)..........................................                   6.05
   (a)(1)(B)..........................................                   6.04
   (a)(2).............................................                   N.A.
   (b)................................................                   6.07
   (c)................................................                   2.12
317(a)(1).............................................                   6.08
   (a)(2).............................................                   6.09
   (b)................................................                   2.04
318(a)................................................                  11.01


   (b)................................................                   N.A.
   (c)................................................                  11.01
- -------------------

N.A. means Not Applicable
*    This Cross-Reference Table is not part of the Indenture


                                TABLE OF CONTENTS

                                                                            PAGE

ARTICLE 1. DEFINITIONS AND INCORPORATION BY REFERENCE.........................1

         SECTION 1.01.    Definitions.........................................1
         SECTION 1.02.    Other Definitions..................................19
         SECTION 1.03.    Incorporation by Reference of TIA..................20
         SECTION 1.04.    Rules of Construction..............................20

ARTICLE 2. THE NOTES.........................................................21

         SECTION 2.01.    Form and Dating....................................21
         SECTION 2.02.    Execution and Authentication.......................22
         SECTION 2.03.    Registrar and Paying Agent.........................22
         SECTION 2.04.    Paying Agent to Hold Money in Trust................23
         SECTION 2.05.    Holder Lists.......................................23
         SECTION 2.06.    Transfer and Exchange..............................23
         SECTION 2.07.    Replacement Notes..................................38
         SECTION 2.08.    Outstanding Notes..................................38
         SECTION 2.09.    Treasury Notes.....................................39
         SECTION 2.10.    Temporary Notes....................................39
         SECTION 2.11.    Cancellation.......................................39
         SECTION 2.12.    Defaulted Interest.................................39

ARTICLE 3. REDEMPTION AND PREPAYMENT.........................................40

         SECTION 3.01.    Notices to Trustee.................................40
         SECTION 3.02.    Selection of Notes to Be Redeemed..................40
         SECTION 3.03.    Notice of Redemption...............................40
         SECTION 3.04.    Effect of Notice of Redemption.....................41
         SECTION 3.05.    Deposit of Redemption Price........................41
         SECTION 3.06.    Notes Redeemed in Part.............................42
         SECTION 3.07.    Optional Redemption................................42
         SECTION 3.08.    Mandatory Redemption...............................42
         SECTION 3.09.    Offer to Purchase by Application of Excess
                              Proceeds.......................................42

ARTICLE 4. COVENANTS.........................................................44

         SECTION 4.01.    Payment of Notes...................................44
         SECTION 4.02.    Maintenance of Office or Agency....................45
         SECTION 4.03.    Reports............................................45
         SECTION 4.04.    Compliance Certificate.............................46
         SECTION 4.05.    Taxes..............................................47
         SECTION 4.06.    Stay, Extension and Usury Laws.....................47
         SECTION 4.07.    Restricted Payments................................47

                                       i


         SECTION 4.08.    Dividend and Other Payment Restrictions Affecting
                              Subsidiaries...................................50
         SECTION 4.09.    Incurrence of Indebtedness and Issuance of
                              Preferred Stock................................51
         SECTION 4.10.    Asset Sales........................................54
         SECTION 4.11.    Transactions with Affiliates.......................55
         SECTION 4.12.    Liens..............................................56
         SECTION 4.13.    Business Activities................................56
         SECTION 4.14.    Corporate Existence................................56
         SECTION 4.15.    Offer to Repurchase upon Change of Control.........56
         SECTION 4.16.    Limitation on Sale and Leaseback Transactions......57
         SECTION 4.17.    [Reserved].........................................58
         SECTION 4.18.    Limitation on Issuances of Guarantees of
                              Indebtedness...................................58

ARTICLE 5. SUCCESSORS........................................................58

         SECTION 5.01.    Merger, Consolidation or Sale of Assets............58
         SECTION 5.02.    Successor Corporation Substituted..................59

ARTICLE 6. DEFAULTS AND REMEDIES.............................................59

         SECTION 6.01.    Events of Default..................................59
         SECTION 6.02.    Acceleration.......................................61
         SECTION 6.03.    Other Remedies.....................................61
         SECTION 6.04.    Waiver of Past Defaults............................61
         SECTION 6.05.    Control by Majority................................62
         SECTION 6.06.    Limitation on Suits................................62
         SECTION 6.07.    Rights of Holders of Notes to Receive Payment......62
         SECTION 6.08.    Collection Suit by Trustee.........................62
         SECTION 6.09.    Trustee May File Proofs of Claim...................63
         SECTION 6.10.    Priorities.........................................63
         SECTION 6.11.    Undertaking for Costs..............................64

ARTICLE 7. TRUSTEE...........................................................64

         SECTION 7.01.    Duties of Trustee..................................64
         SECTION 7.02.    Rights of Trustee..................................65
         SECTION 7.03.    Individual Rights of Trustee.......................66
         SECTION 7.04.    Trustee's Disclaimer...............................66
         SECTION 7.05.    Notice of Defaults.................................66
         SECTION 7.06.    Reports by Trustee to Holders of the Notes.........66
         SECTION 7.07.    Compensation and Indemnity.........................67
         SECTION 7.08.    Replacement of Trustee.............................67
         SECTION 7.09.    Successor Trustee by Merger, etc...................68
         SECTION 7.10.    Eligibility; Disqualification......................69
         SECTION 7.11.    Preferential Collection of Claims Against Company..69

                                       ii


ARTICLE 8. LEGAL DEFEASANCE AND COVENANT DEFEASANCE..........................69

         SECTION 8.01.    Option to Effect Legal Defeasance or Covenant
                              Defeasance.....................................69
         SECTION 8.02.    Legal Defeasance and Discharge.....................69
         SECTION 8.03.    Covenant Defeasance................................70
         SECTION 8.04.    Conditions to Legal or Covenant Defeasance.........70
         SECTION 8.05.    Deposited Money and Government Securities to Be
                              Held in Trust; Other Miscellaneous Provisions..72
         SECTION 8.06.    Repayment to Company...............................72
         SECTION 8.07.    Reinstatement......................................72

ARTICLE 9. AMENDMENT, SUPPLEMENT AND WAIVER..................................73

         SECTION 9.01.    Without Consent of Holders of Notes................73
         SECTION 9.02.    With Consent of Holders of Notes...................74
         SECTION 9.03.    Compliance with Trust Indenture Act................75
         SECTION 9.04.    Revocation and Effect of Consents..................75
         SECTION 9.05.    Notation on or Exchange of Notes...................75
         SECTION 9.06.    Trustee to Sign Amendments, etc....................76

ARTICLE 10. MISCELLANEOUS....................................................76

         SECTION 10.01.   Trust Indenture Act Controls.......................76
         SECTION 10.02.   Notices............................................76
         SECTION 10.03.   Communication by Holders of Notes with Other
                          Holders of Notes...................................77
         SECTION 10.04.   Certificate and Opinion as to Conditions
                              Precedent......................................77
         SECTION 10.05.   Statements Required in Certificate or Opinion......78
         SECTION 10.06.   Rules by Trustee and Agents........................78
         SECTION 10.07.   No Personal Liability of Directors, Officers,
                          Employees and Stockholders.........................78
         SECTION 10.08.   Governing Law......................................79
         SECTION 10.09.   No Adverse Interpretation of Other Agreements......79
         SECTION 10.10.   Successors.........................................79
         SECTION 10.11.   Severability.......................................79
         SECTION 10.12.   Counterpart Originals..............................79
         SECTION 10.13.   Table of Contents, Headings, etc...................79


EXHIBITS

Exhibit A-1       FORM OF NOTE
Exhibit A-2       FORM OF REGULATION S GLOBAL NOTE
Exhibit B         FORM OF CERTIFICATE OF TRANSFER
Exhibit C         FORM OF CERTIFICATE OF EXCHANGE
Exhibit D         FORM OF CERTIFICATE OF ACQUIRING INSTITUTIONAL ACCREDITED
                  INVESTORS

                                      iii


Exhibit E         FORM OF SUPPLEMENTAL INDENTURE
                  TO BE DELIVERED BY SUBSEQUENT GUARANTORS

                                       iv


     INDENTURE dated as of February 2, 2001 between SBA Communications
Corporation, a Florida corporation (the "COMPANY"), and State Street Bank and
Trust Company, a Massachusetts trust company, as trustee (the "TRUSTEE").

     The Company and the Trustee agree as follows for the benefit of each other
and for the equal and ratable benefit of the Holders of the 10 1/4% Series A
Senior Notes due 2009 (the "SERIES A NOTES") and the 10 1/4% Series B Senior
Notes due 2009 (the "SERIES B NOTES" and, together with the Series A Notes, the
"NOTES"):

                                   ARTICLE 1.
                   DEFINITIONS AND INCORPORATION BY REFERENCE

     SECTION 1.01.    DEFINITIONS.

         "144A GLOBAL NOTE" means one or more global notes in the form of
Exhibit A-1 hereto bearing the Global Note Legend and the Private Placement
Legend and deposited with or on behalf of, and registered in the name of, the
Depositary or its nominee that will represent the aggregate principal amount of
the Notes sold in reliance on Rule 144A.

         "ACQUIRED DEBT" means, with respect to any specified Person, (i)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Subsidiary of such specified Person, including,
without limitation, Indebtedness incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person, and (ii) Indebtedness secured by a Lien
encumbering any asset acquired by such specified Person.

         "ADJUSTED CONSOLIDATED CASH FLOW" has the meaning given to such term in
the definition of "Debt to Adjusted Consolidated Cash Flow Ratio."

         "AFFILIATE" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling," "controlled by"
and "under common control with"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by agreement or otherwise, provided that
beneficial ownership of 10% or more of the Voting Stock of a Person shall be
deemed to be control.

         "AGENT" means any Registrar, Paying Agent or co-registrar.

         "APPLICABLE PROCEDURES" means, with respect to any transfer or exchange
of or for beneficial interests in any Global Note, the rules and procedures of
the Depositary, Euroclear and Clearstream that apply to such transfer or
exchange.

         "ASSET SALE" means (i) the sale, lease, conveyance or other disposition
of any assets or rights (including, without limitation, by way of a sale and
leaseback, as seller), in any


case, outside of the ordinary course of business provided that the sale, lease,
conveyance or other disposition of all or substantially all of the assets of the
Company and its Subsidiaries taken as a whole will be governed by the provisions
of this Indenture described in Section 4.15 and/or the provisions described in
Section 5.01 and not by the provisions of Section 4.10 and (ii) the issue or
sale by the Company or any of its Restricted Subsidiaries of Equity Interests of
any of the Company's Subsidiaries (other than (x) directors' qualifying shares
or shares required by applicable law to be held by a Person other than the
Company or a Restricted Subsidiary or (y) Permitted Subsidiary Equity
Interests), in the case of either clause (i) or (ii), whether in a single
transaction or a series of related transactions (a) that have a fair market
value in excess of $2.0 million or (b) for net proceeds in excess of $2.0
million.

         Notwithstanding the foregoing, the following items shall not be deemed
to be Asset Sales: (i) a transfer of assets by the Company to a Restricted
Subsidiary or by a Restricted Subsidiary to the Company or to another Restricted
Subsidiary, (ii) an issuance of Equity Interests by a Subsidiary to the Company
or to another Restricted Subsidiary, (iii) a Restricted Payment or Permitted
Investment that is permitted by Section 4.07, (iv) grants of leases or licenses
in the ordinary course of business, and (v) disposals of Cash Equivalents.

         "ATTRIBUTABLE DEBT" in respect of a sale and leaseback transaction
means, at the time of determination, the present value (discounted at the rate
of interest implicit in such transaction, determined in accordance with GAAP) of
the obligation of the lessee for net rental payments during the remaining term
of the lease included in such sale and leaseback transaction (including any
period for which such lease has been extended or may, at the option of the
lessor, be extended).

         "BANKRUPTCY LAW" means Title 11, U.S. Code or any similar federal or
state law for the relief of debtors.

         "BOARD OF DIRECTORS" means the Board of Directors of the Company, or
any authorized committee of the Board of Directors.

         "BROKER-DEALER" means any broker or dealer registered under the
Exchange Act.

         "BUSINESS DAY" means any day other than a Legal Holiday.

         "CAPITAL LEASE OBLIGATION" means, at the time any determination thereof
is to be made, the amount of the liability in respect of a capital lease that
would at such time be required to be capitalized on a balance sheet in
accordance with GAAP.

         "CAPITAL STOCK" means (i) in the case of a corporation, corporate
stock, (ii) in the case of an association or business entity, any and all
shares, interests, participations, rights or other equivalents (however
designated) of corporate stock, (iii) in the case of a partnership or limited
liability company, partnership or membership interests (whether general or
limited) and (iv) any other interest or participation that confers on a Person
the right to receive a share of the profits and losses of, or distributions of
assets of, the issuing Person.

                                      -2-


         "CASH EQUIVALENTS" means (i) United States dollars, (ii) securities
issued or directly and fully guaranteed or insured by the United States
government or any agency or instrumentality thereof (provided that the full
faith and credit of the United States is pledged in support thereof) having
maturities of not more than 12 months from the date of acquisition, (iii)
certificates of deposit and eurodollar time deposits with maturities of 12
months or less from the date of acquisition, bankers' acceptances with
maturities not exceeding 12 months and overnight bank deposits, in each case
with any lender party to the Senior Credit Facility or with any domestic
commercial bank having capital and surplus in excess of $500.0 million and a
Thompson Bank Watch Rating of "B" or better, (iv) repurchase obligations with a
term of not more than seven days for underlying securities of the types
described in clauses (ii) and (iii) above entered into with any financial
institution meeting the qualifications specified in clause (iii) above, (v)
commercial paper having the highest rating obtainable from Moody's Investors
Service, Inc. or Standard & Poor's Ratings Group and in each case maturing
within 12 months after the date of acquisition and (vi) money market funds at
least 95% of the assets of which constitute Cash Equivalents of the kinds
described in clauses (i)-(v) of this definition.

         "CHANGE OF CONTROL" means the occurrence of any of the following: (i)
the sale, lease, transfer, conveyance or other disposition (other than by way of
merger or consolidation), in one or a series of related transactions, of all or
substantially all of the assets of the Company and its Restricted Subsidiaries,
taken as a whole to any "person" (as such term is used in Section 13(d)(3) of
the Exchange Act) other than a Principal or a Related Party of a Principal; (ii)
the adoption of a plan relating to the liquidation or dissolution of the
Company; (iii) the filing of a petition by or against the Company under any
bankruptcy or insolvency laws, which petition, if involuntary, is not withdrawn
within sixty (60) calendar days after such filing; (iv) any Person other than
the Principal or his Related Parties has the right or ability by voting power or
contract to (a) elect or designate for election a majority of the Board of
Directors of the Company or (b) direct the operation of the Company pursuant to
a management agreement or similar agreement, other than officers or directors
serving in their capacities as such; (v) the consummation of any transaction
(including, without limitation, any merger or consolidation) the result of which
is that any "person" (as defined above) other than the Principal and his Related
Parties, becomes the "beneficial owner" (as such term is defined in Rule 13d-3
and Rule 13d-5 under the Exchange Act, except that a person shall be deemed to
have "beneficial ownership" of all securities that such person has the right to
acquire, whether such right is currently exercisable or is exercisable only upon
the occurrence of a subsequent condition), directly or indirectly, of more than
50% of the Voting Stock of the Company (measured by voting power rather than
number of shares); (vi) the first day on which a majority of the members of the
Board of Directors of the Company are not Continuing Directors; or (vii) the
Company consolidates with, or merges with or into, any Person, or any Person
consolidates with, or merges with or into, the Company, in any such event
pursuant to a transaction in which any of the outstanding Voting Stock of the
Company is converted into or exchanged for cash, securities or other property,
other than any such transaction where (x) the Voting Stock of the Company
outstanding immediately prior to such transaction is converted into or exchanged
for Voting Stock (other than Disqualified Stock) of the surviving or transferee
Person constituting a majority of the outstanding shares of such Voting Stock of
such surviving or transferee Person (immediately after giving effect to such
issuance) or (y) the Principals and their Related Parties own a majority of such
outstanding shares after such transaction.

                                      -3-


         "CLEARSTREAM" means Clearstream Banking S.A.

         "COMPANY" has the meaning provided in the preamble to this Indenture.

         "COMPLETED TOWER" means any wireless communication tower owned or
managed by the Company or any of its Restricted Subsidiaries that, as of any
date of determination (i) has at least one wireless tenant that has executed a
definitive lease with the Company or any of its Restricted Subsidiaries and (ii)
has capacity for at least two tenants in addition to the tenant referred to in
clause (i) of this definition.

         "CONSOLIDATED CASH FLOW" means, with respect to any Person for any
period, the Consolidated Net Income of such Person for such period plus:

          (i) provision for taxes based on income or profits of such Person and
     its Restricted Subsidiaries for such period to the extent that such
     provision for taxes was included in computing such Consolidated Net Income,
     plus

          (ii) "CONSOLIDATED INTEREST EXPENSE", which means

          (A) consolidated interest expense of such Person and its Restricted
     Subsidiaries for such period determined in accordance with GAAP, whether
     paid or accrued and whether or not capitalized (including, without
     limitation, amortization of debt issuance costs and original issue
     discount, non-cash interest payments, the interest component of any
     deferred payment obligations, the interest component of all payments
     associated with Capital Lease Obligations, imputed interest with respect to
     Attributable Debt, commissions, discounts and other fees and charges
     incurred in respect of letter of credit or bankers' acceptance financings,
     and net payments (if any) pursuant to Hedging Obligations), to the extent
     that any such expense was deducted in computing such Consolidated Net
     Income, plus

          (B) all preferred stock dividends paid or accrued in respect of the
     Company's and its Restricted Subsidiaries' preferred stock to Persons other
     than the Company or a Wholly Owned Restricted Subsidiary of the Company
     other than preferred stock dividends paid by the Company in shares of
     preferred stock that is not Disqualified Stock, plus

          (iii) depreciation, amortization (including amortization of goodwill
     and other intangibles and other non-cash expenses (excluding any such
     non-cash expense to the extent that it represents an accrual of or reserve
     for cash expenses in any future period)) of such Person and its Restricted
     Subsidiaries for such period to the extent that such depreciation,
     amortization and other non-cash expenses were deducted in computing such
     Consolidated Net Income, minus

          (iv) non-cash items increasing such Consolidated Net Income for such
     period (excluding any items that were accrued in the ordinary course of
     business), in each case on a consolidated basis and determined in
     accordance with GAAP.

                                      -4-


         "CONSOLIDATED INDEBTEDNESS" means, with respect to any Person as of any
date of determination, the sum, without duplication, of (i) the total amount of
Indebtedness of such Person and its Restricted Subsidiaries, plus (ii) the total
amount of Indebtedness of any other Person, to the extent that such Indebtedness
has been Guaranteed by the referent Person or one or more of its Restricted
Subsidiaries, plus (iii) the aggregate liquidation value of all Disqualified
Stock of such Person and all preferred stock of Restricted Subsidiaries of such
Person (other than Permitted Subsidiary Equity Interests), in each case,
determined on a consolidated basis in accordance with GAAP.

         "CONSOLIDATED INTEREST EXPENSE" has the meaning given to such term in
the definition of Consolidated Cash Flow.

         "CONSOLIDATED NET INCOME" means, with respect to any Person for any
period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that:

          (i) the Net Income (but not loss) of any Person (other than the
     Company) that is not a Restricted Subsidiary of the Company or that is
     accounted for by the equity method of accounting shall be excluded, except
     that for purposes of determining compliance with Section 4.07, such Net
     Income shall be included but only to the extent of the amount of dividends
     or distributions paid in cash to the referent Person or a Restricted
     Subsidiary thereof,

          (ii) the Net Income of any Person acquired in a pooling of interests
     transaction for any period prior to the date of such acquisition shall be
     excluded,

          (iii) the cumulative effect of a change in accounting principles shall
     be excluded,

          (iv) the Net Income (and net loss) of any Unrestricted Subsidiary
     shall be excluded whether or not distributed to the Company or one of its
     Restricted Subsidiaries or whether or not otherwise included pursuant to
     clause (i) and

          (v) any deferred financing costs written off in connection with the
     early extinguishment of any Indebtedness shall be added back to
     Consolidated Net Income to the extent otherwise deducted therefrom.

         "CONSOLIDATED NET WORTH" of any Person as of any date means the
stockholders' equity (including any Preferred Stock that is classified as equity
under GAAP, other than Disqualified Stock) of such Person and its Restricted
Subsidiaries on a consolidated basis at the end of the fiscal quarter
immediately preceding such date, as determined in accordance with GAAP, less any
amount attributable to Unrestricted Subsidiaries.

         "CONSOLIDATED TANGIBLE ASSETS" means, with respect to the Company, the
total consolidated assets of the Company and its Restricted Subsidiaries, less
the total intangible assets of the Company and its Restricted Subsidiaries, as
shown on the most recent internal consolidated balance sheet of the Company and
such Restricted Subsidiaries calculated on a consolidated basis in accordance
with GAAP.

                                      -5-


         "CONTINUING DIRECTORS" means, as of any date of determination, any
member of the Board of Directors of the Company who (i) was a member of such
Board of Directors on the date of this Indenture, (ii) was nominated for
election or elected to such Board of Directors with the approval of a majority
of the Continuing Directors who were members of such Board at the time of such
nomination or election or (iii) is a designee of a Principal or was nominated by
a Principal.

         "CORPORATE TRUST OFFICE OF THE TRUSTEE" shall be at the address of the
Trustee specified in Section 10.02 hereof or such other address as to which the
Trustee may give notice to the Company.

         "CREDIT FACILITY" means one or more senior debt facilities (including,
without limitation, the Senior Credit Facility) or commercial paper facilities
with banks or other institutional lenders providing for revolving credit loans,
term loans or letters of credit, in each case, as amended, modified, renewed,
refunded, replaced or refinanced in whole or in part from time to time
(including subsequent refinancings).

         "CUSTODIAN" means the Trustee, as custodian with respect to the Notes
in global form, or any successor entity thereto.

         "DEBT TO ADJUSTED CONSOLIDATED CASH FLOW RATIO" means, as of any date
of determination, the ratio of (a) the Consolidated Indebtedness of the Company
as of such date to (b) the sum of (i) the Consolidated Cash Flow of the Company
for the four most recent full fiscal quarters ending immediately prior to such
date for which internal financial statements are available, less the Company's
Tower Cash Flow for such four-quarter period, plus (ii) the product of four
times the Company's Tower Cash Flow for the most recent quarterly period (such
sum being, referred to as "ADJUSTED CONSOLIDATED CASH FLOW"), in each case
determined on a pro forma basis after giving effect to all acquisitions or
dispositions of assets made by the Company and its Subsidiaries from the
beginning of such four-quarter period through and including such date of
determination (including any related financing transactions) as if such
acquisitions and dispositions had occurred at the beginning of such four-quarter
period. For purposes of making the computation referred to above (A)
acquisitions that have been made by the Company or any of its Restricted
Subsidiaries, including through mergers or consolidations and including any
related financing transactions, during the reference period or subsequent to
such reference period and on or prior to the Calculation Date shall be deemed to
have occurred on the first day of the reference period and Consolidated Cash
Flow for such reference period shall be calculated without giving effect to
clause (ii) of the proviso set forth in the definition of Consolidated Net
Income, and (B) the Consolidated Cash Flow attributable to discontinued
operations, as determined in accordance with GAAP, and operations or businesses
disposed of prior to the Calculation Date, shall be excluded.

         "DEFAULT" means any event that is, or with the passage of time or the
giving of notice or both would be, an Event of Default.

         "DEFINITIVE NOTE" means a certificated Note registered in the name of
the Holder thereof and issued in accordance with Section 2.06 hereof, in the
form of Exhibit A-1 hereto

                                      -6-


except that such Note shall not bear the Global Note Legend and shall not have
the "Schedule of Exchanges of Interests in the Global Note" attached thereto.

         "DEPOSITARY" means, with respect to the Notes issuable or issued in
whole or in part in global form, the Person specified in Section 2.03 hereof as
the Depositary with respect to the Notes, and any and all successors thereto
appointed as depositary hereunder and having become such pursuant to the
applicable provision of this Indenture.

         "DISQUALIFIED STOCK" means any Capital Stock that, by its terms (or by
the terms of any security into which it is convertible or for which it is
exchangeable, in each case, at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the Holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the Notes mature; provided, however, (i) that any Capital Stock
that would constitute Disqualified Stock solely because the holders thereof have
the right to require the Company to repurchase such Capital Stock upon the
occurrence of a Change of Control or an Asset Sale shall not constitute
Disqualified Stock if the terms of such Capital Stock provide that the Company
may not repurchase or redeem any such Capital Stock pursuant to such provisions
unless such repurchase or redemption complies with Section 4.07 and (ii) that
any preferred stock that would constitute Disqualified Stock shall not
constitute Disqualified Stock if issued as a dividend on then outstanding shares
of preferred stock of the same class or series.

         "ELIGIBLE INDEBTEDNESS" means any Indebtedness for money borrowed
incurred by one or more Restricted Subsidiaries of the Company, provided that
such Indebtedness for money borrowed is contractually pari passu with and
secured equally and ratably with all other Indebtedness for money borrowed of
such Restricted Subsidiaries, including, without limitation, Indebtedness
outstanding under the New Credit Facility.

         "EQUITY INTERESTS" means Capital Stock and all warrants, options or
other rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock) (it being understood that
Permitted Subsidiary Equity Interests shall not be deemed Equity Interests of
the Company until they have been converted into Equity Interests of the Company
in accordance with the terms thereof).

         "EUROCLEAR" means Morgan Guaranty Trust Company of New York, Brussels
office, as operator of the Euroclear system.

         "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

         "EXCHANGE NOTES" means the Notes issued in the Exchange Offer pursuant
to Section 2.06(f) hereof.

         "EXCHANGE OFFER" means exchange and issuance by the Company of a
principal amount of New Notes (which shall be registered pursuant to the
Exchange Offer Registration Statement) equal to the outstanding principal amount
of Notes that are tendered by such Holders in connection with such exchange and
issuance.

                                      -7-


         "EXCHANGE OFFER REGISTRATION STATEMENT" means the Registration
Statement relating to the Exchange Offer, including the related Prospectus.

         "EXISTING INDEBTEDNESS" means Indebtedness of the Company and its
Subsidiaries (other than Indebtedness under the Credit Facility) in existence on
the date of original issuance of the Notes, until such amounts are repaid.

         "FAIR MARKET VALUE" means the price which could be negotiated in an
arm's length, free market transaction, for cash, between a willing and able
seller and a willing and able buyer, neither of whom is under undue pressure, or
compulsion to complete the transaction. Fair market value shall be determined by
the Board of Directors of the Company acting reasonably and in good faith,
evidenced by a resolution of the Company's Board of Directors delivered to the
Trustee; provided, however, that fair market value shall be determined by a
nationally recognized independent investment banking, accounting or appraisal
firm for any transaction which is reasonably likely to exceed $10 million in
value.

         "FINAL OFFERING MEMORANDUM" means the offering memorandum dated January
26, 2001 relating to the offer and sale of the Notes.

         "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect from time to time.

         "GLOBAL NOTE LEGEND" means the legend set forth in Section 2.06(g)(ii),
which is required to be placed on all Global Notes issued under this Indenture.

         "GLOBAL NOTES" means, individually and collectively, each of the
Restricted Global Note and the Unrestricted Global Note, in the form of Exhibit
A hereto issued in accordance with Section 2.01, 2.06(b)(iv), 2.06(d)(ii) or
2.06(f) hereof.

         "GOVERNMENT SECURITIES" means direct obligations of, or obligations
guaranteed by, the United States of America, and the payment for which the
United States pledges its full faith and credit.

         "GUARANTEE" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, by way of a pledge of
assets or through letters of credit or reimbursement agreements in respect
thereof), of all or any part of any Indebtedness.

         "HEDGING OBLIGATIONS" means, with respect to any Person, the
obligations of such Person under (i) interest rate swap agreements, interest
rate cap agreements and interest rate collar agreements and (ii) other
agreements or arrangements relating to or based upon fluctuations in interest
rates or currency exchange rates.

         "HOLDER" means a Person in whose name a Note is registered.

                                      -8-


         "IAI GLOBAL NOTE" means the Global Note in the form of Exhibit A-1
hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with or on behalf of and registered in the name of the Depositary or
its nominee that will be issued in a denomination equal to the outstanding
principal amount of the Senior Notes sold to Institutional Accredited Investors.

         "INDEBTEDNESS" means, with respect to any Person, any indebtedness of
such Person, whether or not contingent, in respect of borrowed money or
evidenced by bonds, notes, debentures or similar instruments or letters of
credit (or reimbursement agreements in respect thereof) or banker's acceptances
or representing Capital Lease Obligations or the balance deferred and unpaid of
the purchase price of any property or representing any Hedging Obligations,
except any such balance that constitutes an accrued expense or trade payable, if
and to the extent any of the foregoing indebtedness (other than letters of
credit and Hedging Obligations) would appear as a liability upon a balance sheet
of such Person prepared in accordance with GAAP, as well as all Indebtedness of
others secured by a Lien on any asset of such Person whether or not such
Indebtedness is assumed by such Person (the amount of such Indebtedness as of
any date being deemed to be the lesser of the value of such property or assets
as of such date or the principal amount of such Indebtedness of such other
Person so secured) and, to the extent not otherwise included, the Guarantee by
such Person of any Indebtedness of any other Person. The amount of any
Indebtedness outstanding as of any date shall be (i) the accreted value thereof,
in the case of any Indebtedness issued with original issue discount, and (ii)
the principal amount thereof, together with any interest thereon that is more
than 30 days past due, in the case of any other Indebtedness. In calculating the
amount of Indebtedness outstanding, letters of credit supporting obligations
otherwise included as Indebtedness (and reimbursement obligations with respect
to such letters of credit to the extent supporting obligations otherwise
included in Indebtedness) shall not be included.

         "INDENTURE" means this Indenture, as amended or supplemented from time
to time.

         "INDIRECT PARTICIPANT" means a Person who holds a beneficial interest
in a Global Note through a Participant.

         "INSTITUTIONAL ACCREDITED INVESTOR" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act, who are not also QIBs.

         "INVESTMENTS" means, with respect to any Person, all investments by
such Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel and similar
advances to officers and employees made in the ordinary course of business),
purchases or other acquisitions for consideration of Indebtedness, Equity
Interests or other securities, together with all items that are or would be
classified as investments on a balance sheet prepared in accordance with GAAP.
If the Company or any Restricted Subsidiary of the Company sells or otherwise
disposes of all Equity Interests of any direct or indirect Subsidiary of the
Company or a Restricted Subsidiary of the Company issues any of its Equity
Interests such that, in each case, after giving effect to any such sale or
disposition, such Person is no longer a Restricted Subsidiary of the Company,
the Company shall be deemed to have made

                                      -9-


an Investment on the date of any such sale or disposition equal to the fair
market value of the Equity Interests of such Subsidiary not sold or disposed of
in an amount determined as provided in the final paragraph of Section 4.07.

         "ISSUE DATE" means February 2, 2001, the date of original issuance of
the Notes.

         "LEGAL HOLIDAY" means a Saturday, a Sunday or a day on which banking
institutions in the City of New York or at a place of payment are authorized by
law, regulation or executive order to remain closed. If a payment date is a
Legal Holiday at a place of payment, payment may be made at that place on the
next succeeding day that is not a Legal Holiday, and no interest shall accrue on
such payment for the intervening period.

         "LETTER OF TRANSMITTAL" means the letter of transmittal to be prepared
by the Company and sent to all Holders of the Notes for use by such Holders in
connection with the Exchange Offer.

         "LIEN" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law
(including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction).

         "LIQUIDATED DAMAGES" shall have the meaning set forth in the
Registration Rights Agreement.

         "MARCH 1998 SENIOR DISCOUNT NOTE INDENTURE" means that certain
Indenture between the Company and State Street Bank and Trust Company, as
Trustee, dated as of March 2, 1998, as amended by the First Supplemental
Indenture between the Company and the Trustee, dated as of March 5, 1999 and as
amended by the Second Supplemental Indenture between the Company and the
Trustee, dated as of October 28, 1999.

         "NET INCOME" means, with respect to any Person, the net income (loss)
of such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends, excluding, however, (i) any gain or loss,
together with any related provision for taxes on such gain or loss, realized in
connection with (a) any asset sale outside the ordinary course of business
(including, without limitation, dispositions pursuant to sale and leaseback
transactions) or (b) the disposition of any securities by such Person or any of
its Restricted Subsidiaries or the extinguishment of any Indebtedness of such
Person or any of its Restricted Subsidiaries and (ii) any extraordinary gain or
loss, together with any related provision for taxes on such extraordinary gain
or loss.

         "NET PROCEEDS" means the aggregate cash proceeds received by the
Company or any of its Restricted Subsidiaries in respect of any Asset Sale
(including, without limitation, any cash received upon the sale or other
disposition of any non-cash consideration received in any Asset Sale), net of
(i) the direct costs relating to such Asset Sale (including, without limitation,
legal, accounting and investment banking fees, and sales commissions) and any
relocation expenses incurred as a result thereof, (ii) taxes paid or payable as
a result thereof (after taking

                                      -10-


into account any available tax credits or deductions and any tax sharing
arrangements), (iii) amounts required to be applied to the repayment of
Indebtedness (other than Indebtedness under a Credit Facility) secured by a Lien
on the asset or assets that were the subject of such Asset Sale, (iv) all
distributions and other payments required to be made to minority interest
holders in Restricted Subsidiaries as a result of such Asset Sale, (v) the
deduction of appropriate amounts provided by the seller as a reserve in
accordance with GAAP against any liabilities associated with the assets disposed
of in such Asset Sale and retained by the Company or any Restricted Subsidiary
after such Asset Sale, and (vi) without duplication, any reserves that the
Company's Board of Directors determines in good faith should be made in respect
of the sale price of such asset or assets for post closing adjustments; provided
that in the case of any reversal of any reserve referred to in clause (v) or
(vi) above, the amount so reserved shall be deemed to be Net Proceeds from an
Asset Sale as of the date of such reversal.

         "NEW NOTES" means the Company's 10 1/4% Senior Notes due 2009 to be
issued pursuant to this Indenture (i) in the Exchange Offer or (ii) as
contemplated by the Registration Rights Agreement.

         "NON-RECOURSE DEBT" means Indebtedness (i) as to which neither the
Company nor any of its Restricted Subsidiaries (a) provides credit support of
any kind (including any undertaking, agreement or instrument that would
constitute Indebtedness), (b) is directly or indirectly liable (as a guarantor
or otherwise), or (c) constitutes the lender; (ii) no default with respect to
which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness of the
Company or any of its Restricted Subsidiaries to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its stated maturity; and (iii) as to which the lenders have been notified in
writing that they will not have any recourse to the stock or assets of the
Company or any of its Restricted Subsidiaries.

         "NON-U.S. PERSON" means a Person who is not a U.S. Person.

         "NOTES" has the meaning assigned to it in the preamble to this
Indenture.

         "OBLIGATIONS" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.

         "OFFERING" means the offering of the Notes by the Company.

         "OFFICER" means, with respect to any Person, the Chairman of the Board,
the Chief Executive Officer, the President, the Chief Operating Officer, the
Chief Financial Officer, the Treasurer, any Assistant Treasurer, the Controller,
the Secretary or any Vice-President of such Person.

         "OFFICERS' CERTIFICATE" means a certificate signed on behalf of the
Company by two Officers of the Company, one of whom must be the principal
executive officer, the principal financial officer, the treasurer or the
principal accounting officer of the Company, that meets the requirements of
Section 11.05 hereof.

                                      -11-


         "OPINION OF COUNSEL" means an opinion from legal counsel who is
reasonably acceptable to the Trustee, that meets the requirements of Section
10.05 hereof. The counsel may be an employee of or counsel to the Company, any
Subsidiary of the Company or the Trustee.

         "PARTICIPANT" means, with respect to the Depositary, Euroclear or
Clearstream, a Person who has an account with the Depositary, Euroclear or
Clearstream, respectively (and, with respect to The Depository Trust Company,
shall include Euroclear and Clearstream).

         "PARTICIPATING BROKER-DEALER" has the meaning set forth in the
Registration Rights Agreement.

         "PAYMENT RESTRICTION" means, with respect to a subsidiary of any
Person, any encumbrance, restriction or limitation, whether by operation of the
terms of its charter or by reason of any agreement, instrument, judgment,
decree, order, statute, rule or governmental regulation, on the ability of (i)
such subsidiary to (a) pay dividends or make other distributions on its Capital
Stock or make payments on any obligation, liability or Indebtedness owed to such
Person or any other subsidiary of such Person, (b) make loans or advances to
such Person or any other subsidiary of such Person, or (ii) such Person or any
other subsidiary of such Person to receive or retain any such (a) dividends,
distributions or payments, (b) loans or advances or (c) transfer of properties
or assets.

         "PERMITTED BUSINESS" means any business conducted by the Company and
its Restricted Subsidiaries on the date of this Indenture and any other business
related, ancillary or complementary to any such business.

         "PERMITTED INVESTMENTS" means (a) any Investment in the Company or in a
Restricted Subsidiary of the Company; (b) any Investment in Cash Equivalents;
(c) any Investment by the Company or any Restricted Subsidiary of the Company in
a Person, if as a result of such Investment (i) such Person becomes a Restricted
Subsidiary of the Company or (ii) such Person is merged, consolidated or
amalgamated with or into, or transfers or conveys substantially all of its
assets to, or is liquidated into, the Company or a Restricted Subsidiary of the
Company; (d) any Restricted Investment made as a result of the receipt of
non-cash consideration from an Asset Sale that was made pursuant to and in
compliance with Section 4.10, (e) any acquisition of assets solely in exchange
for the issuance of Equity Interests (other than Disqualified Stock) of the
Company; (f) receivables created in the ordinary course of business; (g) loans
or advances to employees made in the ordinary course of business not to exceed
$5.0 million at any one time outstanding; (h) securities and other assets
received in settlement of trade debts or other claims arising in the ordinary
course of business; and (i) other Investments in Permitted Businesses not to
exceed 10% of the Company's Consolidated Tangible Assets at any one time
outstanding (each such Investment being measured as of the date made and without
giving effect to subsequent changes in value).

         "PERMITTED LIENS" means (i) Liens securing Indebtedness of the Company
under one or more Credit Facilities that was permitted by the terms of the
Indenture to be incurred; (ii) Liens securing any Indebtedness of any of the
Company's Restricted Subsidiaries that was permitted by the terms of the
Indenture to be incurred; (iii) Liens in favor of the Company; (iv) Liens
existing on the Issue Date; (v) Liens for taxes, assessments or governmental
charges or

                                      -12-


claims that are not yet delinquent or that are being contested in good faith by
appropriate proceedings promptly instituted and diligently concluded, provided
that any reserve or other appropriate provision as shall be required in
conformity with GAAP shall have been made therefor; (vi) Liens securing
Indebtedness permitted to be incurred under clause (iv) of the second paragraph
of Section 4.09; and (vii) Liens incurred in the ordinary course of business of
the Company or any Restricted Subsidiary of the Company with respect to
obligations that do not exceed $10 million at any one time outstanding and that
(a) are not incurred in connection with the borrowing of money or the obtaining
of advances or credit (other than trade credit in the ordinary course of
business) and (b) do not in the aggregate materially detract from the value of
the property or materially impair the use thereof in the operation of business
by the Company or such Restricted Subsidiary.

         "PERMITTED REFINANCING INDEBTEDNESS" means any Indebtedness of the
Company or any of its Restricted Subsidiaries issued in exchange for, or the net
proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that (i) the principal amount
(or initial accreted value, if applicable) of such Permitted Refinancing
Indebtedness does not exceed the principal amount of (or accreted value, if
applicable), plus accrued interest on, the Indebtedness so extended, refinanced,
renewed, replaced, defeased or refunded (plus the amount of expenses and
prepayment premiums incurred in connection therewith), (ii) such Permitted
Refinancing Indebtedness has a final maturity date later than the final maturity
date of, and has a Weighted Average Life to Maturity equal to or greater than
the Weighted Average Life to Maturity of, the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded, (iii) if the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded is
subordinated in right of payment to the Notes, such Permitted Refinancing
Indebtedness is subordinated in right of payment to, the Notes on terms at least
as favorable to the Holders of Notes as those contained in the documentation
governing the Indebtedness being extended, refinanced, renewed, replaced,
defeased or refunded, and (iv) such Indebtedness is incurred either by the
Company or by the Restricted Subsidiary who is the obligor on the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded.

         "PERMITTED SUBSIDIARY EQUITY INTERESTS" means Equity Interests of
Restricted Subsidiaries of the Company that (i) will automatically convert into
common stock of the Company upon the occurrence of an Event of Default under
this Indenture, (ii) does not entitle the holder to any registration rights,
(iii) is issued as consideration in a Tower Asset Acquisition and (iv) does not
provide for any dividends other than in additional shares of such Equity
Interests.

         "PERSON" means any individual, corporation, partnership, joint venture,
association, joint-stock company, trust, unincorporated organization or
government or agency or political subdivision thereof (including any subdivision
or ongoing business of any such entity or substantially all of the assets of any
such entity, subdivision or business).

         "PRINCIPAL" means Steven E. Bernstein, his spouse, parents, children,
siblings, mother and father-in-law, sons and daughters-in-law and brothers and
sisters-in-law, or any other person who is supported, directly or indirectly, to
a material extent by Mr. Bernstein or their

                                      -13-


lineal descendants, spouses of lineal descendants or lineal descendants of
spouses, whether alive as of the date hereof or born subsequently, any trusts or
other estate planning vehicles for the benefit of any of the foregoing, whether
existing as of the date hereof or created subsequently, or any estate or tax
planning vehicles on the part of Mr. Bernstein.

         "PRIVATE PLACEMENT LEGEND" means the legend set forth in Section
2.06(g)(i) to be placed on all Notes issued under this Indenture except where
otherwise permitted by the provisions of this Indenture.

         "PROSPECTUS" means the prospectus included in a Registration Statement
at the time such Registration Statement is declared effective, as amended or
supplemented by any prospectus supplement and by all other amendments thereto,
including post-effective amendments, and all material incorporated by reference
into such Prospectus.

         "PUBLIC EQUITY OFFERING" means an underwritten primary public offering
of common stock of the Company pursuant to an effective registration statement
under the Securities Act.

         "QUALIFIED EQUITY INTERESTS" means Equity Interests of the Company
other than Disqualified Stock.

         "QUALIFIED PROCEEDS" means assets that are used or useful in, or
Capital Stock of any Person engaged in, a Permitted Business.

         "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

         "REGISTRATION RIGHTS AGREEMENT" means the Registration Rights
Agreement, dated as of February 2, 2001, by and among the Company and the other
parties named on the signature pages thereof, as such agreement may be amended,
modified or supplemented from time to time.

         "REGISTRATION STATEMENT" means any registration statement of the
Company relating to (a) an offering of New Notes pursuant to an Exchange Offer
or (b) the registration for resale of Transfer Restricted Securities pursuant to
the Shelf Registration Statement, in each case, (i) that is filed pursuant to
the provisions of the Registration Rights Agreement and (ii) including the
Prospectus included therein, all amendments and supplements thereto (including
post-effective amendments) and all exhibits and material incorporated by
reference therein.

         "REGULATION S" means Regulation S promulgated under the Securities Act.

         "REGULATION S GLOBAL NOTE" means a Regulation S Temporary Global Note
or Regulation S Permanent Global Note, as appropriate.

         "REGULATION S PERMANENT GLOBAL NOTE" means a permanent global Note in
the form of Exhibit A-1 hereto bearing the Global Note Legend and the Private
Placement Legend and deposited with or on behalf of and registered in the name
of the Depositary or its nominee, issued in a denomination equal to the
outstanding principal amount of the Regulation S Temporary Global Note upon
expiration of the Restricted Period.

                                      -14-


         "REGULATION S TEMPORARY GLOBAL NOTE" means a temporary global Note in
the form of Exhibit A-2 hereto bearing the Private Placement Legend and
deposited with or on behalf of and registered in the name of the Depositary or
its nominee, issued in a denomination equal to the outstanding principal amount
of the Notes initially sold in reliance on Rule 903 of Regulation S.

         "RELATED PARTY" with respect to any Principal means (A) any controlling
stockholder, 80% (or more) owned Subsidiary of such Principal or (B) any trust,
corporation, partnership or other entity, the beneficiaries, stockholders,
members, partners, owners or Persons beneficially holding an 80% or more
controlling interest of which consist of such Principal and/or such other
Persons referred to in the immediately preceding clause (A).

         "RESPONSIBLE OFFICER" when used with respect to the Trustee, means any
officer within the Corporate Trust Administration of the Trustee (or any
successor group of the Trustee) or any other officer of the Trustee customarily
performing functions similar to those performed by any of the above designated
officers and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his knowledge of
and familiarity with the particular subject.

         "RESTRICTED DEFINITIVE NOTE" means a Definitive Note bearing the
Private Placement Legend.

         "RESTRICTED GLOBAL NOTE" means a Global Note bearing the Private
Placement Legend.

         "RESTRICTED INVESTMENT" means an Investment other than a Permitted
Investment.

         "RESTRICTED PERIOD" means the 40-day restricted period as defined in
Regulation S.

         "RESTRICTED SUBSIDIARY" of a Person means any Subsidiary of the
relevant Person that is not an Unrestricted Subsidiary.

         "RULE 144" means Rule 144 promulgated under the Securities Act.

         "RULE 144A" means Rule 144A promulgated under the Securities Act.

         "RULE 903" means Rule 903 promulgated under the Securities Act.

         "RULE 904" means Rule 904 promulgated the Securities Act.

         "SEC" means the Securities and Exchange Commission.

         "SECURITIES ACT" means the Securities Act of 1933, as amended.

         "SELLER PAPER" means Indebtedness incurred by the Company or any of its
Restricted Subsidiaries as consideration in a Tower Asset Acquisition.

                                      -15-


         "SENIOR CREDIT FACILITY" means the Second Amended and Restated Credit
Agreement, dated as of December 16, 1999 by and among the Company, SBA
Telecommunications, Inc., the several lenders from time to parties thereto, and
Lehman Commercial Paper Inc., as administrative agent, and including any related
notes, guarantees, collateral documents, instruments and agreements executed in
connection therewith, and in each case as amended, modified, renewed, refunded,
replaced or refinanced in whole or in part from time to time (including
subsequent refinancings).

         "SHELF REGISTRATION STATEMENT" means the Shelf Registration Statement
as defined in the Registration Rights Agreement.

         "SIGNIFICANT SUBSIDIARY" means, with respect to any Person, any
Restricted Subsidiary of such Person that would be a "significant subsidiary" of
such Person as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date of
the Final Offering Memorandum, except that all references to "10 percent" in
Rule 1-02(w)(1), (2) and (3) shall mean "5 percent."

         "STATED MATURITY" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations to
repay, redeem or repurchase any such interest or principal prior to the date
originally scheduled for the payment thereof.

         "STRATEGIC EQUITY INVESTMENT" means a cash contribution to the common
equity capital of the Company or a purchase from the Company of common Equity
Interests (other than Disqualified Stock), in either case by or from a Strategic
Equity Investor and for aggregate cash consideration of at least $10.0 million.

         "STRATEGIC EQUITY INVESTOR" means a Person engaged in a Permitted
Business whose Total Equity Market Capitalization exceeds $1 billion.

         "SUBSIDIARY" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock entitled (without regard to the occurrence of
any contingency) to vote in the election of directors, managers or trustees
thereof is at the time owned or controlled, directly or indirectly, by such
Person or one or more of the other Subsidiaries of that Person (or a combination
thereof) and (ii) any partnership (a) the sole general partner or the managing
general partner of which is such Person or a Subsidiary of such Person or (b)
the only general partners of which are such Person or one or more Subsidiaries
of such Person (or any combination thereof).

         "SUBSIDIARY GUARANTOR" means a Restricted Subsidiary that guarantees
payment of the Notes pursuant to Section 4.18.

         "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. ss.ss. 77aaa-
77bbbb) as in effect on the date on which this Indenture is qualified under the
TIA.

         "TOTAL EQUITY MARKET CAPITALIZATION" of any Person means, as of any day
of determination, the sum of (i) the product of (A) the aggregate number of
outstanding primary

                                      -16-


shares of common stock of such Person on such day (which shall not include any
options or warrants on, or securities convertible or exchangeable into, shares
of common stock of such person) multiplied by (B) the average closing price of
such common stock listed on a national securities exchange or the Nasdaq
National Market System over the 20 consecutive business days immediately
preceding such day, plus (ii) the liquidation value of any outstanding shares of
preferred stock of such Person on such day.

         "TOWER ASSET ACQUISITION" means an acquisition of Tower Assets or a
business substantially all of the assets of which are Tower Assets.

         "TOWER ASSET EXCHANGE" means any transaction in which the Company or
one of its Restricted Subsidiaries exchanges assets for Tower Assets and/or cash
or Cash Equivalents where the fair market value (evidenced by a resolution of
the Board of Directors set forth in an Officers' Certificate delivered to the
Trustee) of the Tower Assets and cash or Cash Equivalents received by the
Company and its Restricted Subsidiaries in such exchange is at least equal to
the fair market value of the assets disposed of in such exchange.

         "TOWER ASSETS" means wireless transmission towers and related assets
that are located on the site of a transmission tower.

         "TOWER CASH FLOW" means, for any period, the Consolidated Cash Flow of
the Company and its Restricted Subsidiaries for such period that is directly
attributable to site rental revenue, license or management fees paid to manage,
lease or sublease space on communication sites owned, leased or managed by the
Company (collectively, "site leasing revenues"), all determined on a
consolidated basis and in accordance with GAAP. Tower Cash Flow will not include
revenue derived from the sale of assets. In allocating corporate, general,
administrative and other operating expenses that are not, in the financial
statements of the Company allocated to any particular line of business, such
expenses shall be allocated to the Company's site leasing business in proportion
to the percentage of the Company's total revenues for the applicable period that
were site leasing revenues.

         "TRANSFER RESTRICTED SECURITIES" means each Note, until the earliest to
occur of (a) the date on which such Note is exchanged in the Exchange Offer and
entitled to be resold to the public by the Holder thereof without complying with
the prospectus delivery requirements of the Securities Act, (b) the date on
which such Note has been disposed of in accordance with a Shelf Registration
Statement, (c) the date on which such Note is disposed of by a Broker-Dealer
pursuant to the "Plan of Distribution" contemplated by the Exchange Offer
Registration Statement (including delivery of the Prospectus contained therein)
or (d) the date on which such Note is distributable to the public pursuant to
Rule 144 under the Securities Act.

         "TRUSTEE" means the party named as such above until a successor
replaces it in accordance with the applicable provisions of this Indenture and
thereafter means the successor serving hereunder.

         "UNRESTRICTED DEFINITIVE NOTE" means one or more Definitive Notes that
do not bear and are not required to bear the Private Placement Legend.

                                      -17-


         "UNRESTRICTED GLOBAL NOTE" means a permanent Global Note in the form of
Exhibit A-1 attached hereto that bears the Global Note Legend and that has the
"Schedule of Exchanges of Interests in the Global Note" attached thereto, and
that is deposited with or on behalf of and registered in the name of the
Depositary, representing a series of Notes that do not bear the Private
Placement Legend.

         "UNRESTRICTED SUBSIDIARY" means any Subsidiary of the Company that is
designated by the Board of Directors as an Unrestricted Subsidiary pursuant to a
Board Resolution; but only to the extent that such Subsidiary:

               (a) has no Indebtedness other than Non-Recourse Debt;

               (b) is not party to any agreement, contract, arrangement or
         understanding with the Company or any Restricted Subsidiary of the
         Company unless the terms of any such agreement, contract, arrangement
         or understanding are no less favorable to the Company or such
         Restricted Subsidiary than those that might be obtained at the time
         from Persons who are not Affiliates of the Company;

               (c) is a Person with respect to which neither the Company nor any
         of its Restricted Subsidiaries has any direct or indirect obligation
         (x) to subscribe for additional Equity Interests or (y) to maintain or
         preserve such Person's financial condition or to cause such Person to
         achieve any specified levels of operating results;

               (d) has not guaranteed or otherwise directly or indirectly
         provided credit support for any Indebtedness of the Company or any of
         its Restricted Subsidiaries; and

               (e) has at least one director on its board of directors that is
         not a director or executive officer of the Company or any of its
         Restricted Subsidiaries and has at least one executive officer that is
         not a director or executive officer of the Company or any of its
         Restricted Subsidiaries.

         Any such designation by the Board of Directors shall be evidenced to
the Trustee by filing with the Trustee a certified copy of the Board Resolution
giving effect to such designation and an Officers' Certificate certifying that
such designation complied with the foregoing conditions and was permitted by
Section 4.07. If, at any time, any Unrestricted Subsidiary would fail to meet
the foregoing requirements as an Unrestricted Subsidiary, it shall thereafter
cease to be an Unrestricted Subsidiary for purposes of the Indenture and any
Indebtedness of such Subsidiary shall be deemed to be incurred by a Restricted
Subsidiary of the Company as of such date (and, if such Indebtedness is not
permitted to be incurred as of such date Section 4.09, the Company shall be in
default of such covenant). The Board of Directors of the Company may at any time
designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided
that such designation shall be deemed to be an incurrence of Indebtedness by a
Restricted Subsidiary of the Company of any outstanding Indebtedness of such
Unrestricted Subsidiary and such designation shall only be permitted if (i) such
Indebtedness is permitted under Section 4.09, calculated on a pro forma basis as
if such designation had occurred at the

                                      -18-


beginning of the four-quarter reference period, and (ii) no Default would occur
or be in existence following such designation.

         "U.S. PERSON" means a U.S. person as defined in Rule 902(o) under the
Securities Act.

         "VOTING STOCK" of any Person as of any date means the Capital Stock of
such Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.

         "WEIGHTED AVERAGE LIFE TO MATURITY" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing (i) the sum
of the products obtained by multiplying (a) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (b) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (ii) the then outstanding principal
amount of such Indebtedness.

         "WHOLLY OWNED RESTRICTED SUBSIDIARY" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person or by one or more Wholly Owned Restricted
Subsidiaries of such Person.

     SECTION 1.02.    OTHER DEFINITIONS.

                                                                      Defined in
                     Term                                               Section
                     ----                                               -------

"Affiliate Transaction"...........................................        4.11
"Asset Sale Offer"................................................        3.09
"Authentication Order" ...........................................        2.02
"Change of Control Offer" ........................................        4.15
"Change of Control Payment" ......................................        4.15
"Change of Control Payment Date" .................................        4.15
"Commission" .....................................................        4.03
"Covenant Defeasance" ............................................        8.03
"Event of Default" ...............................................        6.01
"Excess Proceeds" ................................................        4.10
"incur" ..........................................................        4.09
"Legal Defeasance" ...............................................        8.02
"Offer Amount"....................................................        3.09
"Offer Period" ...................................................        3.09
"Pari Passu Notes" ...............................................        4.10
"Paying Agent" ...................................................        2.03
"Permitted Debt" .................................................        4.09
"Purchase Date" ..................................................        3.09
"Registrar" ......................................................        2.03
"Restricted Payments".............................................        4.07
"Subsidiary Guarantee"............................................        4.18

                                      -19-


     SECTION 1.03.    INCORPORATION BY REFERENCE OF TIA

         Whenever this Indenture refers to a provision of the TIA, the provision
is incorporated by reference in and made a part of this Indenture.

         The following TIA terms used in this Indenture have the following
meanings:

         "INDENTURE SECURITIES" means the Notes;

         "INDENTURE SECURITY HOLDER" means a Holder of a Note;

         "INDENTURE TO BE QUALIFIED" means this Indenture;

         "INDENTURE TRUSTEE" or "INSTITUTIONAL TRUSTEE" means the Trustee; and

         "OBLIGOR" on the Notes means the Company and any successor obligor upon
the Notes.

         All other terms used in this Indenture that are defined by the TIA,
defined by TIA reference to another statute or defined by SEC rule under the TIA
have the meanings so assigned to them.

     SECTION 1.04.    RULES OF CONSTRUCTION.

         Unless the context otherwise requires:

               (1) a term has the meaning assigned to it;

               (2) an accounting term not otherwise defined has the meaning
         assigned to it in accordance with GAAP;

               (3) "or" is not exclusive;

               (4) words in the singular include the plural, and in the plural
         include the singular;

               (5) provisions apply to successive events and transactions; and

               (6) references to sections of or rules under the Securities Act
         shall be deemed to include substitute, replacement of successor
         sections or rules adopted by the SEC from time to time.

                                      -20-


                                  ARTICLE 2.

                                    THE NOTES

     SECTION 2.01.    FORM AND DATING.

         (a) GENERAL.

         The Notes and the Trustee's certificate of authentication shall be
substantially in the form of Exhibit A hereto. The Notes may have notations,
legends or endorsements required by law, stock exchange rule or usage. Each Note
shall be dated the date of its authentication. The Notes shall be in
denominations of $1,000 and integral multiples thereof.

         The terms and provisions contained in the Notes shall constitute, and
are hereby expressly made, a part of this Indenture and the Company and the
Trustee, by their execution and delivery of this Indenture, expressly agree to
such terms and provisions and to be bound thereby. However, to the extent any
provision of any Note conflicts with the express provisions of this Indenture,
the provisions of this Indenture shall govern and be controlling.

         (b) GLOBAL NOTES.

         Notes issued in global form shall be substantially in the form of
Exhibit A-1 or A-2 attached hereto (including the Global Note Legend thereon and
the "Schedule of Exchanges of Interests in the Global Note" attached thereto).
Notes issued in definitive form shall be substantially in the form of Exhibit
A-1 attached hereto (but without the Global Note Legend thereon and without the
"Schedule of Exchanges of Interests in the Global Note" attached thereto). Each
Global Note shall represent such of the outstanding Notes as shall be specified
therein and each shall provide that it shall represent the aggregate principal
amount of outstanding Notes from time to time endorsed thereon and that the
aggregate principal amount of outstanding Notes represented thereby may from
time to time be reduced or increased, as appropriate, to reflect exchanges and
redemptions. Any endorsement of a Global Note to reflect the amount of any
increase or decrease in the aggregate principal amount of outstanding Notes
represented thereby shall be made by the Trustee or the Note Custodian, at the
direction of the Trustee, in accordance with instructions given by the Holder
thereof as required by Section 2.06 hereof.

         (c) TEMPORARY GLOBAL NOTES.

         Notes offered and sold in reliance on Regulation S shall be issued
initially in the form of the Regulation S Temporary Global Note, which shall be
deposited on behalf of the purchasers of the Notes represented thereby with the
Trustee, as custodian for the Depositary, and registered in the name of the
Depositary or the nominee of the Depositary for the accounts of designated
agents holding on behalf of Euroclear or Clearstream, duly executed by the
Company and authenticated by the Trustee as hereinafter provided. The Restricted
Period shall be terminated upon the receipt by the Trustee of (i) a written
certificate from the Depositary, together with copies of certificates from
Euroclear and Clearstream certifying that they have received certification of
non-United States beneficial ownership of 100% of the aggregate principal amount
of the Regulation S Temporary Global Note (except to the extent of any
beneficial owners thereof who acquired an interest therein during the Restricted
Period pursuant

                                      -21-


to another exemption from registration under the Securities Act and who will
take delivery of a beneficial ownership interest in a 144A Global Note or an IAI
Global Note bearing a Private Placement Legend, all as contemplated by Section
2.06(a)(ii) hereof), and (ii) an Officers' Certificate from the Company.
Following the termination of the Restricted Period, beneficial interests in the
Regulation S Temporary Global Note shall be exchanged for beneficial interests
in Regulation S Permanent Global Notes pursuant to the Applicable Procedures.
Simultaneously with the authentication of Regulation S Permanent Global Notes,
the Trustee shall cancel the Regulation S Temporary Global Note. The aggregate
principal amount of the Regulation S Temporary Global Note and the Regulation S
Permanent Global Notes may from time to time be increased or decreased by
adjustments made on the records of the Trustee and the Depositary or its
nominee, as the case may be, in connection with transfers of interest as
hereinafter provided.

         (d) EUROCLEAR AND CLEARSTREAM PROCEDURES APPLICABLE.

         The provisions of the "Operating Procedures of the Euroclear System"
and "Terms and Conditions Governing Use of Euroclear" and the "General Terms and
Conditions of Clearstream" and "Customer Handbook" of Clearstream shall be
applicable to transfers of beneficial interests in the Regulation S Temporary
Global Note and the Regulation S Permanent Global Notes that are held by
Participants through Euroclear or Clearstream.

     SECTION 2.02.    EXECUTION AND AUTHENTICATION.

         One Officer shall sign the Notes for the Company by manual or facsimile
signature. The Company's seal shall be reproduced on the Notes and may be in
facsimile form.

         If an Officer whose signature is on a Note no longer holds that office
at the time a Note is authenticated, the Note shall nevertheless be valid.

         A Note shall not be valid until authenticated by the manual signature
of the Trustee. The signature shall be conclusive evidence that the Note has
been authenticated under this Indenture.

         The Trustee shall, upon a written order of the Company signed by an
Officer (an "AUTHENTICATION ORDER"), authenticate Notes for original issue up to
the aggregate principal amount stated in paragraph 4 of the Notes. The aggregate
principal amount of Notes outstanding at any time may not exceed such amount
except as provided in Section 2.07 hereof.

         The Trustee may appoint an authenticating agent acceptable to the
Company to authenticate Notes. An authenticating agent may authenticate Notes
whenever the Trustee may do so. Each reference in this Indenture to
authentication by the Trustee includes authentication by such agent. An
authenticating agent has the same rights as an Agent to deal with Holders or an
Affiliate of the Company.

     SECTION 2.03.    REGISTRAR AND PAYING AGENT.

         The Company shall maintain an office or agency where Notes may be
presented for registration of transfer or for exchange ("REGISTRAR") and an
office or agency where Notes may be presented for payment ("PAYING AGENT"). The
Registrar shall keep a register of the Notes

                                      -22-


and of their transfer and exchange. The Company may appoint one or more
co-registrars and one or more additional paying agents. The term "Registrar"
includes any co-registrar and the term "Paying Agent" includes any additional
paying agent. The Company may change any Paying Agent or Registrar without
notice to any Holder. The Company shall notify the Trustee in writing of the
name and address of any Agent not a party to this Indenture. If the Company
fails to appoint or maintain another entity as Registrar or Paying Agent, the
Trustee shall act as such. The Company or any of its Subsidiaries may act as
Paying Agent or Registrar.

         The Company initially appoints The Depository Trust Company ("DTC") to
act as Depositary with respect to the Global Notes.

         The Company initially appoints the Trustee to act as the Registrar and
Paying Agent and to act as Note Custodian with respect to the Global Notes.

     SECTION 2.04.    PAYING AGENT TO HOLD MONEY IN TRUST.

         The Company shall require each Paying Agent other than the Trustee to
agree in writing that the Paying Agent will hold in trust for the benefit of
Holders or the Trustee all money held by the Paying Agent for the payment of
principal, premium or Liquidated Damages, if any, or interest on the Notes, and
will notify the Trustee of any default by the Company in making any such
payment. While any such default continues, the Trustee may require a Paying
Agent to pay all money held by it to the Trustee. The Company at any time may
require a Paying Agent to pay all money held by it to the Trustee. Upon payment
over to the Trustee, the Paying Agent (if other than the Company or a
Subsidiary) shall have no further liability for the money. If the Company or a
Subsidiary acts as Paying Agent, it shall segregate and hold in a separate trust
fund for the benefit of the Holders all money held by it as Paying Agent. Upon
any bankruptcy or reorganization proceedings relating to the Company, the
Trustee shall serve as Paying Agent for the Notes.

     SECTION 2.05.    HOLDER LISTS.

         The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
all Holders and shall otherwise comply with TIA ss. 312(a). If the Trustee is
not the Registrar, the Company shall furnish to the Trustee at least seven
Business Days before each interest payment date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes and the Company shall otherwise comply with TIA ss. 312(a).

     SECTION 2.06.    TRANSFER AND EXCHANGE.

         (a) TRANSFER AND EXCHANGE OF GLOBAL NOTES. A Global Note may not be
transferred as a whole except by the Depositary to a nominee of the Depositary,
by a nominee of the Depositary to the Depositary or to another nominee of the
Depositary, the Depositary or any such nominee to a successor Depositary or a
nominee of such successor Depositary. All Global Notes will be exchanged by the
Company for Definitive Notes if (i) the Company delivers to the Trustee notice
from the Depositary that it is unwilling or unable to continue to act as
Depositary or that it is no longer a clearing agency registered under the
Exchange Act and, in either case, a

                                      -23-


successor Depositary is not appointed by the Company within 120 days after the
date of such notice from the Depositary, (ii) the Company in its sole discretion
determines that the Global Notes (in whole but not in part) should be exchanged
for Definitive Notes and delivers a written notice to such effect to the Trustee
or (iii) there shall have occurred and be continuing a Default or Event of
Default with respect to the Notes; provided that in no event shall the
Regulation S Temporary Global Note be exchanged by the Company for Definitive
Notes prior to (x) the expiration of the Restricted Period and (y) the receipt
by the Registrar of any certificates required pursuant to Rule 903(c)(3)(ii)(B)
under the Securities Act. Upon the occurrence of any of the preceding events in
(i), (ii) or (iii) above, Definitive Notes shall be issued in such names as the
Depositary shall instruct the Trustee. Global Notes also may be exchanged or
replaced, in whole or in part, as provided in Sections 2.07 and 2.10 hereof.
Every Note authenticated and delivered in exchange for, or in lieu of, a Global
Note or any portion thereof, pursuant to this Section 2.06 or Section 2.07 or
2.10 hereof, shall be authenticated and delivered in the form of, and shall be,
a Global Note. A Global Note may not be exchanged for another Note other than as
provided in this Section 2.06(a), however, beneficial interests in a Global Note
may be transferred and exchanged as provided in Section 2.06(b),(c) or (f)
hereof.

         (b) TRANSFER AND EXCHANGE OF BENEFICIAL INTERESTS IN THE GLOBAL NOTES.
The transfer and exchange of beneficial interests in the Global Notes shall be
effected through the Depositary, in accordance with the provisions of this
Indenture and the Applicable Procedures. Beneficial interests in the Restricted
Global Notes shall be subject to restrictions on transfer comparable to those
set forth herein to the extent required by the Securities Act. Transfers of
beneficial interests in the Global Notes also shall require compliance with
either subparagraph (i) or (ii) below, as applicable, as well as one or more of
the other following subparagraphs, as applicable:

                  (i)    TRANSFER OF BENEFICIAL INTERESTS IN THE SAME GLOBAL
         NOTE. Beneficial interests in any Restricted Global Note may be
         transferred to Persons who take delivery thereof in the form of a
         beneficial interest in the same Restricted Global Note in accordance
         with the transfer restrictions set forth in the Private Placement
         Legend; provided, however, that prior to the expiration of the
         Restricted Period, transfers of beneficial interests in the Temporary
         Regulation S Global Note may not be made to a U.S. Person or for the
         account or benefit of a U.S. Person (other than an Initial Purchaser).
         Beneficial interests in any Unrestricted Global Note may be transferred
         to Persons who take delivery thereof in the form of a beneficial
         interest in an Unrestricted Global Note. No written orders or
         instructions shall be required to be delivered to the Registrar to
         effect the transfers described in this Section 2.06(b)(i).

                  (ii)   ALL OTHER TRANSFERS AND EXCHANGES OF BENEFICIAL
         INTERESTS IN GLOBAL NOTES. In connection with all transfers and
         exchanges of beneficial interests that are not subject to Section
         2.06(b)(i) above, the transferor of such beneficial interest must
         deliver to the Registrar either (A) (1) a written order from a
         Participant or an Indirect Participant given to the Depositary in
         accordance with the Applicable Procedures directing the Depositary to
         credit or cause to be credited a beneficial interest in another Global
         Note in an amount equal to the beneficial interest to be transferred or
         exchanged and (2) instructions given in accordance with the Applicable
         Procedures containing information regarding the Participant account to
         be credited with such increase or (B) (1)

                                      -24-


         a written order from a Participant or an Indirect Participant given to
         the Depositary in accordance with the Applicable Procedures directing
         the Depositary to cause to be issued a Definitive Note in an amount
         equal to the beneficial interest to be transferred or exchanged and (2)
         instructions given by the Depositary to the Registrar containing
         information regarding the Person in whose name such Definitive Note
         shall be registered to effect the transfer or exchange referred to in
         (1) above; provided that in no event shall Definitive Notes be issued
         upon the transfer or exchange of beneficial interests in the Regulation
         S Temporary Global Note prior to (x) the expiration of the Restricted
         Period and (y) the receipt by the Registrar of any certificates
         required pursuant to Rule 903 under the Securities Act. Upon
         consummation of an Exchange Offer by the Company in accordance with
         Section 2.06(f) hereof, the requirements of this Section 2.06(b)(ii)
         shall be deemed to have been satisfied upon receipt by the Registrar of
         the instructions contained in the Letter of Transmittal delivered by
         the Holder of such beneficial interests in the Restricted Global Notes.
         Upon satisfaction of all of the requirements for transfer or exchange
         of beneficial interests in Global Notes contained in this Indenture and
         the Notes or otherwise applicable under the Securities Act, the Trustee
         shall adjust the principal amount of the relevant Global Note(s)
         pursuant to Section 2.06(h) hereof.

                  (iii)  TRANSFER OF BENEFICIAL INTERESTS TO ANOTHER RESTRICTED
         GLOBAL NOTE. A beneficial interest in any Restricted Global Note may be
         transferred to a Person who takes delivery thereof in the form of a
         beneficial interest in another Restricted Global Note if the transfer
         complies with the requirements of Section 2.06(b)(ii) above and the
         Registrar receives the following:

                    (A)  if the transferee will take delivery in the form of a
                         beneficial interest in the 144A Global Note, then the
                         transferor must deliver a certificate in the form of
                         Exhibit B hereto, including the certifications in item
                         (1) thereof;

                    (B)  if the transferee will take delivery in the form of a
                         beneficial interest in the Regulation S Temporary
                         Global Note or the Regulation S Global Note, then the
                         transferor must deliver a certificate in the form of
                         Exhibit B hereto, including the certifications in item
                         (2) thereof; and

                    (C)  if the transferee will take delivery in the form of a
                         beneficial interest in the IAI Global Note, then the
                         transferor must deliver a certificate in the form of
                         Exhibit B hereto, including the certifications and
                         certificates and Opinion of Counsel required by item
                         (3) thereof, if applicable.

                  (iv)   TRANSFER AND EXCHANGE OF BENEFICIAL INTERESTS IN A
         RESTRICTED GLOBAL NOTE FOR BENEFICIAL INTERESTS IN AN UNRESTRICTED
         GLOBAL NOTE. A beneficial interest in any Restricted Global Note may be
         exchanged by any holder thereof for a beneficial interest in an
         Unrestricted Global Note or transferred to a Person who takes delivery

                                      -25-


         thereof in the form of a beneficial interest in an Unrestricted Global
         Note if the exchange or transfer complies with the requirements of
         Section 2.06(b)(ii) above and:

                    (A)  such exchange or transfer is effected pursuant to the
                         Exchange Offer in accordance with the Registration
                         Rights Agreement and the holder of the beneficial
                         interest to be transferred, in the case of an exchange,
                         or the transferee, in the case of a transfer, certifies
                         in the applicable Letter of Transmittal that it is not
                         (1) a broker-dealer, (2) a Person participating in the
                         distribution of the Exchange Notes or (3) a Person who
                         is an affiliate (as defined in Rule 144) of the
                         Company;

                    (B)  such transfer is effected pursuant to the Shelf
                         Registration Statement in accordance with the
                         Registration Rights Agreement;

                    (C)  such transfer is effected by a Participating
                         Broker-Dealer pursuant to the Exchange Offer
                         Registration Statement in accordance with the
                         Registration Rights Agreement; or

                    (D)  the Registrar receives the following:

                           (1)      if the holder of such beneficial interest in
                                    a Restricted Global Note proposes to
                                    exchange such beneficial interest for a
                                    beneficial interest in an Unrestricted
                                    Global Note, a certificate from such holder
                                    in the form of Exhibit C hereto, including
                                    the certifications in item (1)(a) thereof;
                                    or

                           (2)      if the holder of such beneficial interest in
                                    a Restricted Global Note proposes to
                                    transfer such beneficial interest to a
                                    Person who shall take delivery thereof in
                                    the form of a beneficial interest in an
                                    Unrestricted Global Note, a certificate from
                                    such holder in the form of Exhibit B hereto,
                                    including the certifications in item (4)
                                    thereof;

                         and, in each such case set forth in this subparagraph
                         (D), if the Registrar so requests or if the
                         Applicable Procedures so require, an Opinion of
                         Counsel in form reasonably acceptable to the
                         Registrar to the effect that such exchange or
                         transfer is in compliance with the Securities Act and
                         that the restrictions on transfer contained herein
                         and in the Private Placement Legend are no longer
                         required in order to maintain compliance with the
                         Securities Act.

                                      -26-


         If any such transfer is effected pursuant to subparagraph (B) or (D)
above at a time when an Unrestricted Global Note has not yet been issued, the
Company shall issue and, upon receipt of an Authentication Order in accordance
with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
aggregate principal amount of beneficial interests transferred pursuant to
subparagraph (B) or (D) above.

         Beneficial interests in an Unrestricted Global Note cannot be exchanged
for, or transferred to Persons who take delivery thereof in the form of, a
beneficial interest in a Restricted Global Note.

         (c) TRANSFER OR EXCHANGE OF BENEFICIAL INTERESTS FOR DEFINITIVE NOTES.

                  (i)    BENEFICIAL INTERESTS IN RESTRICTED GLOBAL NOTES TO
         RESTRICTED DEFINITIVE NOTES. If any holder of a beneficial interest in
         a Restricted Global Note proposes to exchange such beneficial interest
         for a Restricted Definitive Note or to transfer such beneficial
         interest to a Person who takes delivery thereof in the form of a
         Restricted Definitive Note, then, upon receipt by the Registrar of the
         following documentation:

                    (A)  if the holder of such beneficial interest in a
                         Restricted Global Note proposes to exchange such
                         beneficial interest for a Restricted Definitive Note, a
                         certificate from such holder in the form of Exhibit C
                         hereto, including the certifications in item (2)(a)
                         thereof;

                    (B)  if such beneficial interest is being transferred to a
                         QIB in accordance with Rule 144A under the Securities
                         Act, a certificate to the effect set forth in Exhibit B
                         hereto, including the certifications in item (1)
                         thereof;

                    (C)  if such beneficial interest is being transferred to a
                         Non- U.S. Person in an offshore transaction in
                         accordance with Rule 903 or Rule 904 under the
                         Securities Act, a certificate to the effect set forth
                         in Exhibit B hereto, including the certifications in
                         item (2) thereof;

                    (D)  if such beneficial interest is being transferred
                         pursuant to an exemption from the registration
                         requirements of the Securities Act in accordance with
                         Rule 144 under the Securities Act, a certificate to the
                         effect set forth in Exhibit B hereto, including the
                         certifications in item (3)(a) thereof;

                    (E)  if such beneficial interest is being transferred to an
                         Institutional Accredited Investor in reliance on an
                         exemption from the registration requirements of the
                         Securities Act other than those listed in subparagraphs
                         (B) through (D) above, a certificate to the effect set
                         forth in

                                      -27-


                         Exhibit B hereto, including the certifications,
                         certificates and Opinion of Counsel required by item
                         (3) thereof, if applicable;

                    (F)  if such beneficial interest is being transferred to the
                         Company or any of its Subsidiaries, a certificate to
                         the effect set forth in Exhibit B hereto, including the
                         certifications in item (3)(b) thereof; or

                    (G)  if such beneficial interest is being transferred
                         pursuant to an effective registration statement under
                         the Securities Act, a certificate to the effect set
                         forth in Exhibit B hereto, including the certifications
                         in item (3)(c) thereof

         the Trustee shall cause the aggregate principal amount of the
         applicable Global Note to be reduced accordingly pursuant to Section
         2.06(h) hereof, and the Company shall execute and the Trustee shall
         authenticate and deliver to the Person designated in the instructions a
         Definitive Note in the appropriate principal amount. Any Definitive
         Note issued in exchange for a beneficial interest in a Restricted
         Global Note pursuant to this Section 2.06(c) shall be registered in
         such name or names and in such authorized denomination or denominations
         as the holder of such beneficial interest shall instruct the Registrar
         through instructions from the Depositary and the Participant or
         Indirect Participant. The Trustee shall deliver such Definitive Notes
         to the Persons in whose names such Notes are so registered. Any
         Definitive Note issued in exchange for a beneficial interest in a
         Restricted Global Note pursuant to this Section 2.06(c)(i) shall bear
         the Private Placement Legend and shall be subject to all restrictions
         on transfer contained therein.

                  (ii)   Notwithstanding Sections 2.06(c)(i)(A) and (C) hereof,
         a beneficial interest in the Regulation S Temporary Global Note may not
         be exchanged for a Definitive Note or transferred to a Person who takes
         delivery thereof in the form of a Definitive Note prior to (x) the
         expiration of the Restricted Period and (y) the receipt by the
         Registrar of any certificates required pursuant to Rule
         903(c)(3)(ii)(B) under the Securities Act, except in the case of a
         transfer pursuant to an exemption from the registration requirements of
         the Securities Act other than Rule 903 or Rule 904.

                  (iii)  BENEFICIAL INTERESTS IN RESTRICTED GLOBAL NOTES TO
         UNRESTRICTED DEFINITIVE NOTES. A holder of a beneficial interest in a
         Restricted Global Note may exchange such beneficial interest for an
         Unrestricted Definitive Note or may transfer such beneficial interest
         to a Person who takes delivery thereof in the form of an Unrestricted
         Definitive Note only if:

                    (A)  such exchange or transfer is effected pursuant to the
                         Exchange Offer in accordance with the Registration
                         Rights Agreement and the holder of such beneficial
                         interest, in the case of an exchange, or the
                         transferee, in the case of a transfer, certifies in the
                         applicable Letter of Transmittal that

                                      -28-


                         it is not (1) a broker-dealer, (2) a Person
                         participating in the distribution of the Exchange
                         Notes or (3) a Person who is an affiliate (as defined
                         in Rule 144) of the Company;

                    (B)  such transfer is effected pursuant to the Shelf
                         Registration Statement in accordance with the
                         Registration Rights Agreement;

                    (C)  such transfer is effected by a Participating
                         Broker-Dealer pursuant to the Exchange Offer
                         Registration Statement in accordance with the
                         Registration Rights Agreement; or

                    (D)  the Registrar receives the following:

                           (1)      if the holder of such beneficial interest in
                                    a Restricted Global Note proposes to
                                    exchange such beneficial interest for a
                                    Definitive Note that does not bear the
                                    Private Placement Legend, a certificate from
                                    such holder in the form of Exhibit C hereto,
                                    including the certifications in item (1)(b)
                                    thereof; or

                           (2)      if the holder of such beneficial interest in
                                    a Restricted Global Note proposes to
                                    transfer such beneficial interest to a
                                    Person who shall take delivery thereof in
                                    the form of a Definitive Note that does not
                                    bear the Private Placement Legend, a
                                    certificate from such holder in the form of
                                    Exhibit B hereto, including the
                                    certifications in item (4) thereof;

                         and, in each such case set forth in this subparagraph
                         (D), if the Registrar so requests or if the
                         Applicable Procedures so require, an Opinion of
                         Counsel in form reasonably acceptable to the
                         Registrar to the effect that such exchange or
                         transfer is in compliance with the Securities Act and
                         that the restrictions on transfer contained herein
                         and in the Private Placement Legend are no longer
                         required in order to maintain compliance with the
                         Securities Act.

                  (iv)   BENEFICIAL INTERESTS IN UNRESTRICTED GLOBAL NOTES TO
         UNRESTRICTED DEFINITIVE NOTES. If any holder of a beneficial interest
         in an Unrestricted Global Note proposes to exchange such beneficial
         interest for a Definitive Note or to transfer such beneficial interest
         to a Person who takes delivery thereof in the form of a Definitive
         Note, then, upon satisfaction of the conditions set forth in Section
         2.06(b)(ii) hereof, the Trustee shall cause the aggregate principal
         amount of the applicable Global Note to be reduced accordingly pursuant
         to Section 2.06(h) hereof, and the Company shall execute and the
         Trustee shall authenticate and deliver to the person designated in the
         instructions a

                                      -29-


         Definitive Note in the appropriate principal amount. Any Definitive
         Note issued in exchange for a beneficial interest pursuant to this
         Section 2.06(c)(iv) shall be registered in such name or names and in
         such authorized denomination or denominations as the holder of such
         beneficial interest shall instruct the Registrar through instructions
         from the Depositary and the Participant or Indirect Participant. The
         Trustee shall deliver such Definitive Notes to the Persons in whose
         names such Notes are so registered. Any Definitive Note issued in
         exchange for a beneficial interest pursuant to this Section
         2.06(c)(iii) shall not bear the Private Placement Legend.

               (d) TRANSFER AND EXCHANGE OF DEFINITIVE NOTES FOR BENEFICIAL
                   INTERESTS.

                  (i)    RESTRICTED DEFINITIVE NOTES TO BENEFICIAL INTERESTS IN
         RESTRICTED GLOBAL NOTES. If any Holder of a Restricted Definitive Note
         proposes to exchange such Note for a beneficial interest in a
         Restricted Global Note or to transfer such Restricted Definitive Notes
         to a Person who takes delivery thereof in the form of a beneficial
         interest in a Restricted Global Note, then, upon receipt by the
         Registrar of the following documentation:

                    (A)  if the Holder of such Restricted Definitive Note
                         proposes to exchange such Note for a beneficial
                         interest in a Restricted Global Note, a certificate
                         from such Holder in the form of Exhibit C hereto,
                         including the certifications in item (2)(b) thereof;

                    (B)  if such Restricted Definitive Note is being transferred
                         to a QIB in accordance with Rule 144A under the
                         Securities Act, a certificate to the effect set forth
                         in Exhibit B hereto, including the certifications in
                         item (1) thereof;

                    (C)  if such Restricted Definitive Note is being transferred
                         to a Non-U.S. Person in an offshore transaction in
                         accordance with Rule 903 or Rule 904 under the
                         Securities Act, a certificate to the effect set forth
                         in Exhibit B hereto, including the certifications in
                         item (2) thereof;

                    (D)  if such Restricted Definitive Note is being transferred
                         pursuant to an exemption from the registration
                         requirements of the Securities Act in accordance with
                         Rule 144 under the Securities Act, a certificate to the
                         effect set forth in Exhibit B hereto, including the
                         certifications in item (3)(a) thereof;

                    (E)  if such Restricted Definitive Note is being transferred
                         to an Institutional Accredited Investor in reliance on
                         an exemption from the registration requirements of the
                         Securities Act other than those listed in subparagraphs
                         (B) through (D) above, a certificate to the effect set
                         forth in

                                      -30-


                         Exhibit B hereto, including the certifications,
                         certificates and Opinion of Counsel required by item
                         (3) thereof, if applicable;

                    (F)  if such Restricted Definitive Note is being transferred
                         to the Company or any of its Subsidiaries, a
                         certificate to the effect set forth in Exhibit B
                         hereto, including the certifications in item (3)(b)
                         thereof; or

                    (G)  if such Restricted Definitive Note is being transferred
                         pursuant to an effective registration statement under
                         the Securities Act, a certificate to the effect set
                         forth in Exhibit B hereto, including the certifications
                         in item (3)(c) thereof,

         the Trustee shall cancel the Restricted Definitive Note, increase or
         cause to be increased the aggregate principal amount of, in the case of
         clause (A) above, the appropriate Restricted Global Note, in the case
         of clause (B) above, the 144A Global Note, in the case of clause (C)
         above, the Regulation S Global Note, and in all other cases, the IAI
         Global Note.

                  (ii)   RESTRICTED DEFINITIVE NOTES TO BENEFICIAL INTERESTS IN
         UNRESTRICTED GLOBAL NOTES. A Holder of a Restricted Definitive Note may
         exchange such Note for a beneficial interest in an Unrestricted Global
         Note or transfer such Restricted Definitive Note to a Person who takes
         delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note only if:

                    (A)  such exchange or transfer is effected pursuant to the
                         Exchange Offer in accordance with the Registration
                         Rights Agreement and the Holder, in the case of an
                         exchange, or the transferee, in the case of a transfer,
                         certifies in the applicable Letter of Transmittal that
                         it is not (1) a broker-dealer, (2) a Person
                         participating in the distribution of the Exchange Notes
                         or (3) a Person who is an affiliate (as defined in Rule
                         144) of the Company;

                    (B)  such transfer is effected pursuant to the Shelf
                         Registration Statement in accordance with the
                         Registration Rights Agreement;

                    (C)  such transfer is effected by a Participating
                         Broker-Dealer pursuant to the Exchange Offer
                         Registration Statement in accordance with the
                         Registration Rights Agreement; or

                    (D)  the Registrar receives the following:

                           (1)      if the Holder of such Definitive Notes
                                    proposes to exchange such Notes for a
                                    beneficial interest in the Unrestricted
                                    Global Note, a certificate from such

                                      -31-


                                    Holder in the form of Exhibit C hereto,
                                    including the certifications in item (1)(c)
                                    thereof; or

                           (2)      if the Holder of such Definitive Notes
                                    proposes to transfer such Notes to a Person
                                    who shall take delivery thereof in the form
                                    of a beneficial interest in the Unrestricted
                                    Global Note, a certificate from such Holder
                                    in the form of Exhibit B hereto, including
                                    the certifications in item (4) thereof;

                           and, in each such case set forth in this subparagraph
                           (D), if the Registrar so requests or if the
                           Applicable Procedures so require, an Opinion of
                           Counsel in form reasonably acceptable to the
                           Registrar to the effect that such exchange or
                           transfer is in compliance with the Securities Act and
                           that the restrictions on transfer contained herein
                           and in the Private Placement Legend are no longer
                           required in order to maintain compliance with the
                           Securities Act.

         Upon satisfaction of the conditions of any of the subparagraphs in this
Section 2.06(d)(ii), the Trustee shall cancel the Definitive Notes and increase
or cause to be increased the aggregate principal amount of the Unrestricted
Global Note.

                  (iii)  UNRESTRICTED DEFINITIVE NOTES TO BENEFICIAL INTERESTS
         IN UNRESTRICTED GLOBAL NOTES. A Holder of an Unrestricted Definitive
         Note may exchange such Note for a beneficial interest in an
         Unrestricted Global Note or transfer such Definitive Notes to a Person
         who takes delivery thereof in the form of a beneficial interest in an
         Unrestricted Global Note at any time. Upon receipt of a request for
         such an exchange or transfer, the Trustee shall cancel the applicable
         Unrestricted Definitive Note and increase or cause to be increased the
         aggregate principal amount of one of the Unrestricted Global Notes.

         If any such exchange or transfer from a Definitive Note to a beneficial
interest is effected pursuant to subparagraphs (ii)(B), (ii)(D) or (iii) above
at a time when an Unrestricted Global Note has not yet been issued, the Company
shall issue and, upon receipt of an Authentication Order in accordance with
Section 2.02 hereof, the Trustee shall authenticate one or more Unrestricted
Global Notes in an aggregate principal amount equal to the principal amount of
Definitive Notes so transferred.

         (e) TRANSFER AND EXCHANGE OF DEFINITIVE NOTES FOR DEFINITIVE NOTES.
Upon request by a Holder of Definitive Notes and such Holder's compliance with
the provisions of this Section 2.06(e), the Registrar shall register the
transfer or exchange of Definitive Notes. Prior to such registration of transfer
or exchange, the requesting Holder shall present or surrender to the Registrar
the Definitive Notes duly endorsed or accompanied by a written instruction of
transfer in form satisfactory to the Registrar duly executed by such Holder or
by such Holder's attorney, duly authorized in writing. In addition, the
requesting Holder shall provide any additional

                                      -32-


certifications, documents and information, as applicable, required pursuant to
the following provisions of this Section 2.06(e).

                  (i)    RESTRICTED DEFINITIVE NOTES TO RESTRICTED DEFINITIVE
         NOTES. Any Restricted Definitive Note may be transferred to and
         registered in the name of Persons who take delivery thereof in the form
         of a Restricted Definitive Note if the Registrar receives the
         following:

                    (A)  if the transfer will be made pursuant to Rule 144A
                         under the Securities Act, then the transferor must
                         deliver a certificate in the form of Exhibit B hereto,
                         including the certifications in item (1) thereof;

                    (B)  if the transfer will be made pursuant to Rule 903 or
                         Rule 904, then the transferor must deliver a
                         certificate in the form of Exhibit B hereto, including
                         the certifications in item (2) thereof; and

                    (C)  if the transfer will be made pursuant to any other
                         exemption from the registration requirements of the
                         Securities Act, then the transferor must deliver a
                         certificate in the form of Exhibit B hereto, including
                         the certifications, certificates and Opinion of Counsel
                         required by item (3) thereof, if applicable.

                  (ii)   RESTRICTED DEFINITIVE NOTES TO UNRESTRICTED DEFINITIVE
         NOTES. Any Restricted Definitive Note may be exchanged by the Holder
         thereof for an Unrestricted Definitive Note or transferred to a Person
         or Persons who take delivery thereof in the form of an Unrestricted
         Definitive Note if:

                    (A)  such exchange or transfer is effected pursuant to the
                         Exchange Offer in accordance with the Registration
                         Rights Agreement and the Holder, in the case of an
                         exchange, or the transferee, in the case of a transfer,
                         certifies in the applicable Letter of Transmittal that
                         it is not (1) a broker-dealer, (2) a Person
                         participating in the distribution of the Exchange Notes
                         or (3) a Person who is an affiliate (as defined in Rule
                         144) of the Company;

                    (B)  any such transfer is effected pursuant to the Shelf
                         Registration Statement in accordance with the
                         Registration Rights Agreement;

                    (C)  any such transfer is effected by a Participating
                         Broker-Dealer pursuant to the Exchange Offer
                         Registration Statement in accordance with the
                         Registration Rights Agreement; or

                                      -33-


                    (D)  the Registrar receives the following:

                           (1)      if the Holder of such Restricted Definitive
                                    Notes proposes to exchange such Notes for an
                                    Unrestricted Definitive Note, a certificate
                                    from such Holder in the form of Exhibit C
                                    hereto, including the certifications in item
                                    (1)(d) thereof; or

                           (2)      if the Holder of such Restricted Definitive
                                    Notes proposes to transfer such Notes to a
                                    Person who shall take delivery thereof in
                                    the form of an Unrestricted Definitive Note,
                                    a certificate from such Holder in the form
                                    of Exhibit B hereto, including the
                                    certifications in item (4) thereof;

                           and, in each such case set forth in this subparagraph
                           (D), if the Registrar so requests, an Opinion of
                           Counsel in form reasonably acceptable to the Company
                           to the effect that such exchange or transfer is in
                           compliance with the Securities Act and that the
                           restrictions on transfer contained herein and in the
                           Private Placement Legend are no longer required in
                           order to maintain compliance with the Securities Act.

                  (iii)  UNRESTRICTED DEFINITIVE NOTES TO UNRESTRICTED
         DEFINITIVE NOTES. A Holder of Unrestricted Definitive Notes may
         transfer such Notes to a Person who takes delivery thereof in the form
         of an Unrestricted Definitive Note. Upon receipt of a request to
         register such a transfer, the Registrar shall register the Unrestricted
         Definitive Notes pursuant to the instructions from the Holder thereof.

         (f) EXCHANGE OFFER. Upon the occurrence of the Exchange Offer in
accordance with the Registration Rights Agreement, the Company shall issue and,
upon receipt of an Authentication Order in accordance with Section 2.02, the
Trustee shall authenticate (i) one or more Unrestricted Global Notes in an
aggregate principal amount equal to the principal amount of the beneficial
interests in the Restricted Global Notes tendered for acceptance by Persons that
certify in the applicable Letters of Transmittal that (x) they are not
broker-dealers, (y) they are not participating in a distribution of the Exchange
Notes and (z) they are not affiliates (as defined in Rule 144) of the Company,
and accepted for exchange in the Exchange Offer and (ii) Definitive Notes in an
aggregate principal amount equal to the principal amount of the Restricted
Definitive Notes accepted for exchange in the Exchange Offer. Concurrently with
the issuance of such Notes, the Trustee shall cause the aggregate principal
amount of the applicable Restricted Global Notes to be reduced accordingly, and
the Company shall execute and the Trustee shall authenticate and deliver to the
Persons designated by the Holders of Definitive Notes so accepted Definitive
Notes in the appropriate principal amount.

                                      -34-


         (g) LEGENDS. The following legends shall appear on the face of all
Global Notes and Definitive Notes issued under this Indenture unless
specifically stated otherwise in the applicable provisions of this Indenture.

                  (i)    PRIVATE PLACEMENT LEGEND.

                  (A) Except as permitted by subparagraph (B) below, each Global
         Note and each Definitive Note (and all Notes issued in exchange
         therefor or substitution thereof) shall bear the legend in
         substantially the following form.

         "THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY
         ISSUED IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE
         UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
         ACT"), AND THE SECURITY EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR
         OTHERWISE TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN
         APPLICABLE EXEMPTION THEREFROM. EACH PURCHASER OF THE SECURITY
         EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER MAY BE RELYING ON
         THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE SECURITIES ACT
         PROVIDED BY RULE 144A THEREUNDER. THE HOLDER OF THE SECURITY EVIDENCED
         HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) SUCH SECURITY MAY
         BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a) TO A PERSON
         WHO THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER
         (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION
         MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING THE
         REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE
         UNITED STATES TO A FOREIGN PERSON IN A TRANSACTION MEETING THE
         REQUIREMENTS OF RULE 903 OR 904 UNDER THE SECURITIES ACT OR (d) IN
         ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF
         THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF THE COMPANY
         SO REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE
         REGISTRATION STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH ANY
         APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR ANY
         OTHER APPLICABLE JURISDICTION AND (B) THE HOLDER WILL, AND EACH
         SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER FROM IT OF THE
         SECURITY EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN (A)
         ABOVE."

                  (B) Notwithstanding the foregoing, any Global Note or
         Definitive Note issued pursuant to subparagraphs (b)(iv), (c)(ii),
         (c)(iii), (d)(ii), (d)(iii), (e)(ii), (e)(iii) or (f) of this Section
         2.06 (and all Notes issued in exchange therefor or substitution
         thereof) shall not bear the Private Placement Legend.

                                      -35-


                  (ii)   GLOBAL NOTE LEGEND. Each Global Note shall bear a
         legend in substantially the following form:

               "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE
               INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE
               BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE
               TO ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE
               MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED PURSUANT TO
               SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
               EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF
               THE INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE
               TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THE
               INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A
               SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE
               COMPANY."

                  (iii)  REGULATION S TEMPORARY GLOBAL NOTE LEGEND. The
         Regulation S Temporary Global Note shall bear a legend in substantially
         the following form:

               "THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE,
               AND THE CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR
               CERTIFICATED NOTES, ARE AS SPECIFIED IN THE INDENTURE (AS DEFINED
               HEREIN). NEITHER THE HOLDER NOR THE BENEFICIAL OWNERS OF THIS
               REGULATION S TEMPORARY GLOBAL NOTE SHALL BE ENTITLED TO RECEIVE
               PAYMENT OF INTEREST HEREON."

         (h) CANCELLATION AND/OR ADJUSTMENT OF GLOBAL NOTES

         At such time as all beneficial interests in a particular Global Note
have been exchanged for Definitive Notes or a particular Global Note has been
redeemed, repurchased or canceled in whole and not in part, each such Global
Note shall be returned to or retained and canceled by the Trustee in accordance
with Section 2.11 hereof. At any time prior to such cancellation, if any
beneficial interest in a Global Note is exchanged for or transferred to a Person
who will take delivery thereof in the form of a beneficial interest in another
Global Note or for Definitive Notes, the principal amount of Notes represented
by such Global Note shall be reduced accordingly and an endorsement shall be
made on such Global Note by the Trustee or by the Depositary at the direction of
the Trustee to reflect such reduction; and if the beneficial interest is being
exchanged for or transferred to a Person who will take delivery thereof in the
form of a beneficial interest in another Global Note, such other Global Note
shall be increased accordingly and an endorsement shall be made on such Global
Note by the Trustee or by the Depositary at the direction of the Trustee to
reflect such increase.

                                      -36-


         (i)    GENERAL PROVISIONS RELATING TO TRANSFERS AND EXCHANGES.

                  (i)    To permit registrations of transfers and exchanges, the
         Company shall execute and the Trustee shall authenticate Global Notes
         and Definitive Notes upon the Company's order or at the Registrar's
         request.

                  (ii)   No service charge shall be made to a holder of a
         beneficial interest in a Global Note or to a Holder of a Definitive
         Note for any registration of transfer or exchange, but the Company may
         require payment of a sum sufficient to cover any transfer tax or
         similar governmental charge payable in connection therewith (other than
         any such transfer taxes or similar governmental charge payable upon
         exchange or transfer pursuant to Sections 2.10, 3.06, 3.09, 4.10, 4.15
         and 9.05 hereof).

                  (iii)  The Registrar shall not be required to register the
         transfer of or to exchange any Note selected for redemption in whole or
         in part, except the unredeemed portion of any Note being redeemed in
         part.

                  (iv)   All Global Notes and Definitive Notes issued upon any
         registration of transfer or exchange of Global Notes or Definitive
         Notes shall be the valid obligations of the Company, evidencing the
         same debt, and entitled to the same benefits under this Indenture, as
         the Global Notes or Definitive Notes surrendered upon such registration
         of transfer or exchange.

                  (v)    The Registrar shall not be required (A) to issue, to
         register the transfer of or to exchange any Notes during a period
         beginning at the opening of business 15 days before the day of any
         selection of Notes for redemption under Section 3.02 hereof and ending
         at the close of business on the day of selection, (B) to register the
         transfer of or to exchange any Note so selected for redemption in whole
         or in part, except the unredeemed portion of any Note being redeemed in
         part or (c) to register the transfer of or to exchange a Note between a
         record date and the next succeeding Interest Payment Date.

                  (vi)   Prior to due presentment for the registration of a
         transfer of any Note, the Trustee, any Agent and the Company may deem
         and treat the Person in whose name any Note is registered as the
         absolute owner of such Note for the purpose of receiving payment of
         principal of and interest on such Notes and for all other purposes, and
         none of the Trustee, any Agent or the Company shall be affected by
         notice to the contrary.

                  (vii)  The Trustee shall authenticate Global Notes and
         Definitive Notes in accordance with the provisions of Section 2.02
         hereof.

                  (viii) All certifications, certificates and Opinions of
         Counsel required to be submitted to the Registrar pursuant to this
         Section 2.06 to effect a registration of transfer or exchange may be
         submitted by facsimile.

                                      -37-


     SECTION 2.07.    REPLACEMENT NOTES.

         If any mutilated Note is surrendered to the Trustee or the Company and
the Trustee receives evidence to its satisfaction of the destruction, loss or
theft of any Note, the Company shall issue and the Trustee, upon receipt of an
Authentication Order, shall authenticate a replacement Note if the Trustee's
requirements are met. If required by the Trustee or the Company, an indemnity
bond must be supplied by the Holder that is sufficient in the judgment of the
Trustee and the Company to protect the Company, the Trustee, any Agent and any
authenticating agent from any loss that any of them may suffer if a Note is
replaced. The Company may charge for its expenses in replacing a Note.

         Every replacement Note is an additional obligation of the Company and
shall be entitled to all of the benefits of this Indenture equally and
proportionately with all other Notes duly issued hereunder.

     SECTION 2.08.    OUTSTANDING NOTES.

         The Notes outstanding at any time are all the Notes authenticated by
the Trustee except for those canceled by it, those delivered to it for
cancellation, those reductions in the interest in a Global Note effected by the
Trustee in accordance with the provisions hereof, and those described in this
Section as not outstanding. Except as set forth in Section 2.09 hereof, a Note
does not cease to be outstanding because the Company or an Affiliate of the
Company holds the Note; however, Notes held by the Company or a Subsidiary of
the Company shall not be deemed to be outstanding for purposes of Section
3.07(b) hereof.

         If a Note is replaced pursuant to Section 2.07 hereof, it ceases to be
outstanding unless the Trustee receives proof satisfactory to it that the
replaced Note is held by a bona fide purchaser.

         If the principal amount of any Note is considered paid under Section
4.01 hereof, it ceases to be outstanding and interest on it ceases to accrue.

         If the Paying Agent (other than the Company, a Subsidiary or an
Affiliate of any thereof) holds, on a redemption date or maturity date, money
sufficient to pay Notes payable on that date, then on and after that date such
Notes shall be deemed to be no longer outstanding and shall cease to accrue
interest.

                                      -38-


     SECTION 2.09.    TREASURY NOTES.

         In determining whether the Holders of the required principal amount of
Notes have concurred in any direction, waiver or consent, Notes owned by the
Company, or by any Person directly or indirectly controlling or controlled by or
under direct or indirect common control with the Company, shall be considered as
though not outstanding, except that for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Notes that the Trustee knows are so owned shall be so disregarded.

     SECTION 2.10.    TEMPORARY NOTES.

         Until certificates representing Notes are ready for delivery, the
Company may prepare and the Trustee, upon receipt of an Authentication Order,
shall authenticate temporary Notes. Temporary Notes shall be substantially in
the form of certificated Notes but may have variations that the Company
considers appropriate for temporary Notes and as shall be reasonably acceptable
to the Trustee. Without unreasonable delay, the Company shall prepare and the
Trustee shall authenticate definitive Notes in exchange for temporary Notes.

         Holders of temporary Notes shall be entitled to all of the benefits of
this Indenture.

     SECTION 2.11.    CANCELLATION.

         The Company at any time may deliver Notes to the Trustee for
cancellation. The Registrar and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee and no one else shall cancel all Notes surrendered for registration of
transfer, exchange, payment, replacement or cancellation and shall destroy
canceled Notes (subject to the record retention requirement of the Exchange
Act). Certification of the destruction of all canceled Notes shall be delivered
to the Company. The Company may not issue new Notes to replace Notes that it has
paid or that have been delivered to the Trustee for cancellation.

     SECTION 2.12.    DEFAULTED INTEREST.

         If the Company defaults in a payment of interest on the Notes, it shall
pay the defaulted interest in any lawful manner plus, to the extent lawful,
interest payable on the defaulted interest, to the Persons who are Holders on a
subsequent special record date, in each case at the rate provided in the Notes
and in Section 4.01 hereof. The Company shall notify the Trustee in writing of
the amount of defaulted interest proposed to be paid on each Note and the date
of the proposed payment. The Company shall fix or cause to be fixed each such
special record date and payment date; provided that no such special record date
shall be less than 10 days prior to the related payment date for such defaulted
interest. At least 15 days before the special record date, the Company (or, upon
the written request of the Company, the Trustee in the name and at the expense
of the Company) shall mail or cause to be mailed to Holders a notice that states
the special record date, the related payment date and the amount of such
interest to be paid.

                                      -39-


                                   ARTICLE 3.
                            REDEMPTION AND PREPAYMENT

     SECTION 3.01.    NOTICES TO TRUSTEE.

         If the Company elects to redeem Notes pursuant to the optional
redemption provisions of Section 3.07 hereof, it shall furnish to the Trustee,
at least 45 days but not more than 60 days before a redemption date, an
Officers' Certificate setting forth (i) the clause of this Indenture pursuant to
which the redemption shall occur, (ii) the redemption date, (iii) the principal
amount of Notes to be redeemed and (iv) the redemption price (expressed as a
percentage or principal amount).

     SECTION 3.02.    SELECTION OF NOTES TO BE REDEEMED.

         If less than all of the Notes are to be redeemed or purchased in an
offer to purchase at any time, the Trustee shall select the Notes to be redeemed
or purchased among the Holders of the Notes in compliance with the requirements
of the principal national securities exchange, if any, on which the Notes are
listed or, if the Notes are not so listed, on a pro rata basis; PROVIDED that no
Notes of $1,000 or less shall be redeemed in part. In the event of partial
redemption by lot, the particular Notes to be redeemed shall be selected, unless
otherwise provided herein, not less than 30 nor more than 60 days prior to the
redemption date by the Trustee from the outstanding Notes not previously called
for redemption.

         The Trustee shall promptly notify the Company in writing of the Notes
selected for redemption and, in the case of any Note selected for partial
redemption, the principal amount thereof to be redeemed. Notes and portions of
Notes selected shall be in amounts of $1,000 or whole multiples of $1,000;
except that if all of the Notes of a Holder are to be redeemed, the entire
outstanding amount of Notes held by such Holder, even if not a multiple of
$1,000, shall be redeemed. Except as provided in the preceding sentence,
provisions of this Indenture that apply to Notes called for redemption also
apply to portions of Notes called for redemption.

     SECTION 3.03.    NOTICE OF REDEMPTION.

         Subject to the provisions of Section 3.09 hereof, at least 30 days but
not more than 60 days before a redemption date, the Company shall mail or cause
to be mailed, by first class mail, a notice of redemption to each Holder whose
Notes are to be redeemed at its registered address.

         The notice shall identify the Notes to be redeemed and shall state:

                  (a) the redemption date;

                  (b) the redemption price;

                  (c) if any Note is being redeemed in part, the portion of the
         principal amount of such Note to be redeemed and that, after the
         redemption date upon surrender of such Note, a new Note or Notes in
         principal amount equal to the unredeemed portion shall be issued upon
         cancellation of the original Note;

                                      -40-


                  (d) the name and address of the Paying Agent;

                  (e) that Notes called for redemption must be surrendered to
         the Paying Agent to collect the redemption price;

                  (f) that, unless the Company defaults in making such
         redemption payment, interest on Notes called for redemption ceases to
         accrue on and after the redemption date;

                  (g) the paragraph of the Notes and/or Section of this
         Indenture pursuant to which the Notes called for redemption are being
         redeemed; and

                  (h) that no representation is made as to the correctness or
         accuracy of the CUSIP number, if any, listed in such notice or printed
         on the Notes.

         At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company shall have delivered to the Trustee, at least 45 days prior to the
redemption date, an Officers' Certificate requesting that the Trustee give such
notice and setting forth the information to be stated in such notice as provided
in the preceding paragraph.

     SECTION 3.04.    EFFECT OF NOTICE OF REDEMPTION.

         Once notice of redemption is mailed in accordance with Section 3.03
hereof, Notes called for redemption become irrevocably due and payable on the
redemption date at the redemption price. A notice of redemption may not be
conditional.

     SECTION 3.05.    DEPOSIT OF REDEMPTION PRICE.

         One Business Day prior to the redemption date, the Company shall
deposit with the Trustee or with the Paying Agent money sufficient to pay the
redemption price of and accrued interest on all Notes to be redeemed on that
date. The Trustee or the Paying Agent shall promptly return to the Company any
money deposited with the Trustee or the Paying Agent by the Company in excess of
the amounts necessary to pay the redemption price of, and accrued interest on,
all Notes to be redeemed.

         If the Company complies with the provisions of the preceding paragraph,
on and after the redemption date, interest shall cease to accrue on the Notes or
the portions of Notes called for redemption. If a Note is redeemed on or after
an interest record date but on or prior to the related interest payment date,
then any accrued and unpaid interest shall be paid to the Person in whose name
such Note was registered at the close of business on such record date. If any
Note called for redemption shall not be so paid upon surrender for redemption
because of the failure of the Company to comply with the preceding paragraph,
interest shall be paid on the unpaid principal, from the redemption date until
such principal is paid, and to the extent lawful on any interest not paid on
such unpaid principal, in each case at the rate provided in the Notes and in
Section 4.01 hereof.

                                      -41-


     SECTION 3.06.    NOTES REDEEMED IN PART.

         Upon surrender of a Note that is redeemed in part, the Company shall
issue and, upon the Company's written request, the Trustee shall authenticate
for the Holder at the expense of the Company a new Note equal in principal
amount to the unredeemed portion of the Note surrendered.

     SECTION 3.07.    OPTIONAL REDEMPTION.

         (a) Except as set forth in clause (b) of this Section 3.07, the Company
shall not have the option to redeem the Notes pursuant to this Section 3.07
prior to February 1, 2005. Thereafter, the Company shall have the option to
redeem the Notes, in whole or in part, at the redemption prices (expressed as
percentages of principal amount) set forth below plus accrued and unpaid
interest thereon, if any, to the applicable redemption date (subject to the
right of Holders of record on the relevant record date to receive interest due
on the relevant interest payment date), if redeemed during the twelve-month
period beginning on February 1 of the years indicated below:

         Year                                                Percentage
         ----                                                ----------

         2005 ..........................................      105.125%
         2006 ..........................................      103.417%
         2007 ..........................................      101.708%
         2008 and thereafter ...........................      100.000%

         (b) Notwithstanding the provisions of clause (a) of this Section 3.07,
at any time prior to February 1, 2004, the Company may on any one or more
occasions redeem up to 35% of the aggregate principal amount of Notes issued
under this Indenture at a redemption price equal to 110.250% of the principal
amount thereof on the redemption date with the net cash proceeds of one or more
Public Equity Offerings and/or Strategic Equity Investments; provided that at
least 65% of the aggregate principal amount of Notes issued under this Indenture
remains outstanding immediately after the occurrence of such redemption
(excluding Notes held by the Company or any of its Subsidiaries); and provided,
further, that such redemption shall occur within 60 days of the date of the
closing of such Public Equity Offering and/or Strategic Equity Investment.

         (c) Any redemption pursuant to this Section 3.07 shall be made pursuant
to the provisions of Section 3.01 through 3.06 hereof.

     SECTION 3.08.    MANDATORY REDEMPTION.

         The Company shall not be required to make mandatory redemption or
sinking fund payments with respect to the Notes.

     SECTION 3.09.    OFFER TO PURCHASE BY APPLICATION OF EXCESS PROCEEDS.

         In the event that, pursuant to Section 4.10 hereof, the Company shall
be required to commence an offer to holders of Notes and Pari Passu Notes (an
"ASSET SALE OFFER") to

                                      -42-


purchase the maximum principal amount (or accreted value, as applicable, of
Notes and Pari Passu Notes that may be purchased out of Excess Proceeds) of
Notes and Pari Passu Notes it shall follow the procedures specified below.

         The Asset Sale Offer shall remain open for a period of 20 Business Days
following its commencement and no longer, except to the extent that a longer
period is required by applicable law (the "OFFER PERIOD"). No later than five
Business Days after the termination of the Offer Period (the "PURCHASE DATE"),
the Company shall purchase the principal amount (or accreted value, as
applicable) of Notes and Pari Passu Notes required to be purchased pursuant to
Section 4.10 hereof (on a pro rata basis if Notes and Pari Passu Notes tendered
are in excess of the Excess Proceeds) (which maximum principal amount of Notes
shall be the "OFFER Amount") or, if less than the Offer Amount has been
tendered, all Notes and Pari Passu Notes tendered in response to the Asset Sale
Offer. Payment for any Notes so purchased shall be made in the same manner as
interest payments are made.

         If the Purchase Date is on or after an interest record date and on or
before the related interest payment date, any accrued and unpaid interest shall
be paid to the Person in whose name a Note is registered at the close of
business on such record date, and no additional interest shall be payable to
Holders who tender Notes pursuant to the Asset Sale Offer.

         Upon the commencement of an Asset Sale Offer, the Company shall send,
by first class mail, a notice to the Trustee and each of the Holders, with a
copy to the Trustee. The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to the Asset Sale
Offer. The Asset Sale Offer shall be made to all Holders. The notice, which
shall govern the terms of the Asset Sale Offer, shall state:

                  (a) that the Asset Sale Offer is being made pursuant to this
         Section 3.09 and Section 4.10 hereof and the length of time the Asset
         Sale Offer shall remain open;

                  (b) the Offer Amount, the purchase price and the Purchase
         Date;

                  (c) that any Note not tendered or accepted for payment shall
         continue to accrete or accrue interest;

                  (d) that, unless the Company defaults in making such payment,
         any Note accepted for payment pursuant to the Asset Sale Offer shall
         cease to accrete or accrue interest after the Purchase Date;

                  (e) that Holders electing to have a Note purchased pursuant to
         an Asset Sale Offer may only elect to have all of such Note purchased
         and may not elect to have only a portion of such Note purchased;

                  (f) that Holders electing to have a Note purchased pursuant to
         any Asset Sale Offer shall be required to surrender the Note, with the
         form entitled "Option of Holder to Elect Purchase" on the reverse of
         the Note completed, or transfer by book-entry transfer, to the Company,
         a depositary, if appointed by the Company, or a Paying Agent at the
         address specified in the notice at least three days before the Purchase
         Date;

                                      -43-


                  (g) that Holders shall be entitled to withdraw their election
         if the Company, the depositary or the Paying Agent, as the case may be,
         receives, not later than the expiration of the Offer Period, a
         telegram, telex, facsimile transmission or letter setting forth the
         name of the Holder, the principal amount of the Note the Holder
         delivered for purchase and a statement that such Holder is withdrawing
         his election to have such Note purchased;

                  (h) that, if the aggregate principal amount (or accreted
         value, as applicable) of Notes and Pari Passu Notes tendered by Holders
         exceeds the Offer Amount, the Company shall select the Notes to be
         purchased on a pro rata basis (with such adjustments as may be deemed
         appropriate by the Company so that only Notes in denominations of
         $1,000, or integral multiples thereof, shall be purchased and Pari
         Passu Notes); and

                  (i) that Holders whose Notes were purchased only in part shall
         be issued new Notes equal in principal amount to the unpurchased
         portion of the Notes surrendered (or transferred by book-entry
         transfer).

         On or before the Purchase Date, the Company shall, to the extent
lawful, accept for payment, on a pro rata basis to the extent necessary, the
Offer Amount of Notes or portions thereof tendered pursuant to the Asset Sale
Offer, or if less than the Offer Amount has been tendered, all Notes, Pari Passu
Notes or portions thereof tendered, and shall deliver to the Trustee an
Officers' Certificate stating that such Notes, and Pari Passu Notes or portions
thereof were accepted for payment by the Company in accordance with the terms of
this Section 3.09. The Company, the Depositary or the Paying Agent, as the case
may be, shall promptly (but in any case not later than five days after the
Purchase Date) mail or deliver to each tendering Holder an amount equal to the
purchase price of the Notes tendered by such Holder and accepted by the Company
for purchase, and the Company shall promptly issue a new Note, and the Trustee,
upon written request from the Company shall authenticate and mail or deliver
such new Note to such Holder, in a principal amount equal to any unpurchased
portion of the Note surrendered. Any Note not so accepted shall be promptly
mailed or delivered by the Company to the Holder thereof. The Company shall
publicly announce the results of the Asset Sale Offer on the Purchase Date.

         Other than as specifically provided in this Section 3.09, any purchase
pursuant to this Section 3.09 shall be made pursuant to the provisions of
Sections 3.01 through 3.06 hereof.

                                   ARTICLE 4.
                                    COVENANTS

     SECTION 4.01.    PAYMENT OF NOTES.

         The Company shall pay or cause to be paid the principal of, premium, if
any, and interest and liquidated damages, if any, on the Notes on the dates and
in the manner provided in the Notes. Principal, premium, if any, interest and
liquidated damages, if any, shall be considered paid on the date due if the
Paying Agent, if other than the Company or a Subsidiary

                                      -44-


thereof, holds as of 10:00 a.m. Eastern Time on the due date money deposited by
the Company in immediately available funds and designated for and sufficient to
pay all principal, premium, if any, interest and liquidated damages, if any,
then due. The Company shall pay all liquidated damages, if any, in the same
manner on the dates and in the amounts set forth in the Registration Rights
Agreement.

         The Company shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue principal at the rate equal to
1% per annum in excess of the then applicable interest rate on the Notes to the
extent lawful; it shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue installments of interest and
liquidated damages (without regard to any applicable grace period) at the same
rate to the extent lawful.

     SECTION 4.02.    MAINTENANCE OF OFFICE OR AGENCY.

         The Company shall maintain in the Borough of Manhattan, the City of New
York, an office or agency (which may be an office of the Trustee or an affiliate
of the Trustee, Registrar or co-registrar) where Notes may be surrendered for
registration of transfer or for exchange and where notices and demands to or
upon the Company in respect of the Notes and this Indenture may be served. The
Company shall give prompt written notice to the Trustee of the location, and any
change in the location, of such office or agency. If at any time the Company
shall fail to maintain any such required office or agency or shall fail to
furnish the Trustee with the address thereof, such presentations, surrenders,
notices and demands may be made or served at the Corporate Trust Office of the
Trustee.

         The Company may also from time to time designate one or more other
offices or agencies where the Notes may be presented or surrendered for any or
all such purposes and may from time to time rescind such designations; provided,
however, that no such designation or rescission shall in any manner relieve the
Company of its obligation to maintain an office or agency in the Borough of
Manhattan, the City of New York for such purposes. The Company shall give prompt
written notice to the Trustee of any such designation or rescission and of any
change in the location of any such other office or agency.

         The Company hereby designates the Corporate Trust Office of the Trustee
as one such office or agency of the Company in accordance with Section 2.03.

     SECTION 4.03.    REPORTS.

         (a) Whether or not required by the rules and regulations of the
Securities and Exchange Commission (the "COMMISSION"), so long as any Notes are
outstanding, the Company shall furnish to the Holders of Notes (i) all quarterly
and annual financial information that would be required to be contained in a
filing with the Commission on Forms 10-Q and 10-K if the Company were required
to file such Forms, including a "Management's Discussion and Analysis of
Financial Condition and Results of Operations" that describes the financial
condition and results of operations of the Company and its consolidated
Subsidiaries (showing in reasonable detail, in the footnotes to the financial
statements and in "Management's Discussion and Analysis of Financial Condition
and Results of Operations" (in each case to the extent not

                                      -45-


prohibited by the Commission's rules and regulations), (a) the financial
condition and results of operations of the Company and its Restricted
Subsidiaries separate from the financial condition and results of operations of
the Unrestricted Subsidiaries of the Company and (b) the Tower Cash Flow for the
most recently completed fiscal quarter and the Adjusted Consolidated Cash Flow
for the most recently completed four-quarter period) and, with respect to the
annual information only, a report thereon by the Company's certified independent
accountants; and (ii) all current reports that would be required to be filed
with the Commission on Form 8-K if the Company were required to file such
reports, in each case within the time periods specified in the Commission's
rules and regulations. In addition, following the consummation of the exchange
offer contemplated by the Registration Rights Agreement, whether or not required
by the rules and regulations of the Commission, the Company shall file a copy of
all such information and reports with the Commission for public availability
within the time periods specified in the Commission's rules and regulations
(unless the Commission will not accept such a filing) and make such information
available to securities analysts and prospective investors upon request.

         (b) The Company shall, for so long as any Notes remain outstanding,
furnish to the Holders and to securities analysts and prospective investors,
upon their request, the information required to be delivered pursuant to Rule
144A(d)(4) under the Securities Act.

     SECTION 4.04.    COMPLIANCE CERTIFICATE.

         (a) The Company shall deliver to the Trustee, within 90 days after the
end of each fiscal year, an Officers' Certificate stating that a review of the
activities of the Company and its Subsidiaries during the preceding fiscal year
has been made under the supervision of the signing Officers with a view to
determining whether the Company has kept, observed, performed and fulfilled its
obligations under this Indenture, and further stating, as to each such Officer
signing such certificate, that to the best of his or her knowledge the Company
has kept, observed, performed and fulfilled each and every covenant contained in
this Indenture and is not in default in the performance or observance of any of
the terms, provisions and conditions of this Indenture (or, if a Default or
Event of Default shall have occurred, describing all such Defaults or Events of
Default of which he or she may have knowledge and what action the Company is
taking or proposes to take with respect thereto) and that to the best of his or
her knowledge no event has occurred and remains in existence by reason of which
payments on account of the principal of or interest, if any, on the Notes is
prohibited or if such event has occurred, a description of the event and what
action the Company is taking or proposes to take with respect thereto.

         (b) So long as not contrary to the then current recommendations of the
American Institute of Certified Public Accountants, the year-end financial
statements delivered pursuant to Section 4.03(a) above shall be accompanied by a
written statement of the Company's independent public accountants (who shall be
a firm of established national reputation) that in making the examination
necessary for certification of such financial statements, nothing has come to
their attention that would lead them to believe that the Company has violated
any provisions of Article 4 or Article 5 hereof or, if any such violation has
occurred, specifying the nature and period of existence thereof, it being
understood that such accountants shall not be liable directly or indirectly to
any Person for any failure to obtain knowledge of any such violation.

                                      -46-


         (c) The Company shall, so long as any of the Notes are outstanding,
deliver to the Trustee, forthwith upon any Officer becoming aware of any Default
or Event of Default, an Officers' Certificate specifying such Default or Event
of Default and what action the Company is taking or proposes to take with
respect thereto.

     SECTION 4.05.    TAXES.

         The Company shall pay, and shall cause each of its Subsidiaries to pay,
prior to delinquency, all material taxes, assessments, and governmental levies
except such as are contested in good faith and by appropriate proceedings or
where the failure to effect such payment is not adverse in any material respect
to the Holders of the Notes.

     SECTION 4.06.    STAY, EXTENSION AND USURY LAWS.

         The Company covenants (to the extent that it may lawfully do so) that
it shall not at any time insist upon, plead, or in any manner whatsoever claim
or take the benefit or advantage of, any stay, extension or usury law wherever
enacted, now or at any time hereafter in force, that may affect the covenants or
the performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such
law, and covenants that it shall not, by resort to any such law, hinder, delay
or impede the execution of any power herein granted to the Trustee, but shall
suffer and permit the execution of every such power as though no such law has
been enacted.

     SECTION 4.07.    RESTRICTED PAYMENTS.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly: (i) declare or pay any dividend or make
any other payment or distribution on account of the Company's or any of its
Restricted Subsidiaries' Equity Interests (including, without limitation, any
payment in connection with any merger or consolidation involving the Company or
any of its Restricted Subsidiaries) or to the direct or indirect holders of the
Company's or any of its Restricted Subsidiaries' Equity Interests in their
capacity as such (other than dividends or distributions payable (A) in Qualified
Equity Interests or (B) to the Company or a Restricted Subsidiary of the
Company); (ii) purchase, redeem or otherwise acquire or retire for value
(including without limitation, in connection with any merger or consolidation
involving the Company) any Equity Interests of the Company; (iii) designate any
Restricted Subsidiary as an Unrestricted Subsidiary; (iv) make any payment on or
with respect to, or purchase, redeem, defease or otherwise acquire or retire for
value any Indebtedness that is subordinated to the Notes, except a payment of
interest or principal at Stated Maturity (other than payments to the Company or
payments by a Restricted Subsidiary of the Company to the Company or to another
Restricted Subsidiary of the Company); or (v) make any Restricted Investment
(all such payments and other actions set forth in clauses (i) through (v) being
collectively referred to as "Restricted Payments"), unless, at the time of and
after giving effect to such Restricted Payment:

         (a)      no Default shall have occurred and be continuing or would
                  occur as a consequence thereof; and

         (b)      the Company would have been permitted to incur at least $1.00
                  of additional Indebtedness pursuant to the Debt to Adjusted
                  Consolidated

                                      -47-


                  Cash Flow Ratio test set forth in the first paragraph of
                  Section 4.09; provided that the Company and its Restricted
                  Subsidiaries will not be required to comply with this clause
                  (b) in order to make any Restricted Investment; and

         (c)      such Restricted Payment, together with the aggregate amount of
                  all other Restricted Payments made by the Company and its
                  Restricted Subsidiaries after the date of the March 1998
                  Senior Discount Note Indenture (excluding Restricted Payments
                  permitted by clauses (ii) and (iii) of the next succeeding
                  paragraph), is less than the sum, without duplication, of:

                  (1) 100% of the Consolidated Cash Flow of the Company for the
         period (taken as one accounting period) from the beginning of the
         fiscal quarter during which the May 1998 Senior Discount Note Indenture
         was executed to the end of the Company's most recently ended fiscal
         quarter for which internal financial statements are available at the
         time of such Restricted Payment (or, if the Consolidated Cash Flow for
         such period is a deficit, less 100% of the deficit), less 1.75 times
         the Consolidated Interest Expense of the Company since the beginning of
         the fiscal quarter during which the May 1998 Senior Discount Note
         Indenture was executed to the end of the Company's most recently ended
         fiscal quarter for which internal financial statements are available at
         the time of such Restricted Payment; plus

                  (2) (A) 100% of the aggregate net cash proceeds plus (B) 70%
         of the aggregate value, as reflected on the Company's balance sheet in
         accordance with GAAP using purchase accounting, of any Qualified
         Proceeds, in each case as of the date the Company's Equity Interests
         were issued, sold or exchanged therefor received by the Company (from
         persons other than Subsidiaries) since the beginning of the fiscal
         quarter during which the March 1998 Senior Discount Note Indenture was
         executed as a contribution to its common equity capital or from the
         issue and sale of Qualified Equity Interests (except to the extent such
         net cash proceeds are used to incur new Indebtedness outstanding
         pursuant to clause (x) of the second paragraph of Section 4.09) or from
         the issue or sale (whether before or after the beginning of the fiscal
         quarter during which the March 1998 Senior Discount Note Indenture was
         executed) (other than to a Subsidiary of the Company) of Disqualified
         Stock or debt securities of the Company that have been converted into
         Qualified Equity Interests sold to or held by a Subsidiary of the
         Company (provided that any net cash proceeds that are used pursuant to
         Section 3.07(b) shall not be so included); plus

                  (3) to the extent that any Unrestricted Subsidiary of the
         Company is redesignated as or becomes a Restricted Subsidiary after the
         Issue Date; the lesser of:

                           (A) the fair market value of the Company's
                  Investments in such Subsidiaries as of the date they are
                  designated or become Restricted Subsidiaries, and

                                      -48-


                           (B) the sum of:

                  (x) the fair market value of the Company's Investments in such
         Subsidiaries as of the date on which such Subsidiaries were originally
         designated as Unrestricted Subsidiaries, and

                  (y) the amount of any Investments made in such Subsidiaries
         subsequent to such designation (and treated as Restricted Payments) by
         the Company or any Restricted Subsidiary; plus

                  (4) to the extent not included in the Consolidated Cash Flow
         referred to in clause (1) and to the extent that any Restricted
         Investment that was made after the Issue Date is sold for cash or
         otherwise liquidated or repaid for cash, the lesser of:

                           (A) the cash return of capital with respect to the
                  Restricted Investment (less the cost of disposition, if any),
                  and

                           (B) the initial amount of the Restricted Investment;
                  plus

                  (5) 100% of any other dividends or other distributions
         received by the Company or a Restricted Subsidiary of the Company since
         the Issue Date from an Unrestricted Subsidiary of the Company to the
         extent that such dividends were not otherwise included in Consolidated
         Net Income of the Company for such period.

         The foregoing provisions shall not prohibit:

                  (i)    the payment of any dividend within 60 days after the
         date of declaration thereof, if at said date of declaration such
         payment would have complied with the provisions of this Indenture;

                  (ii)   the making of any Investment or the redemption,
         repurchase, retirement, defeasance or other acquisition of any
         subordinated Indebtedness or Equity Interests of the Company or its
         Restricted Subsidiaries in exchange for, or out of the net cash
         proceeds, to the extent of the net cash proceeds received by the
         Company from the sale since the Issue Date (other than to a Subsidiary
         of the Company) of, any Qualified Equity Interests; provided that such
         net cash proceeds are not used to incur new Indebtedness pursuant to
         clause (x) of the second paragraph of Section 4.09 or pursuant to
         Section 3.07(b); and provided further that, in each such case, the
         amount of any such net cash proceeds that are so utilized shall be
         excluded from clause (c)(2) of the preceding paragraph;

                  (iii)  the defeasance, redemption, repurchase or other
         acquisition of subordinated Indebtedness with the net cash proceeds
         from an incurrence of Permitted Refinancing Indebtedness; provided that
         such net cash proceeds are not used to incur new Indebtedness pursuant
         to clause (x) of the second paragraph of Section 4.09 or pursuant to
         Section 3.07(b); and provided further that, in each such case, the
         amount of any such

                                      -49-


         net cash proceeds that are so utilized shall be excluded from clause
         (c)(2) of the preceding paragraph;

                  (iv)   the repurchase, redemption or other acquisition or
         retirement for value of Equity Interests of the Company or any
         Restricted Subsidiary of the Company held by any member of the
         Company's (or any of its Restricted Subsidiaries') management; provided
         that the aggregate amount expended pursuant to this clause (iv) shall
         not exceed $500,000 in any twelve-month period;

                  (v)    the repurchase of Equity Interests of the Company that
         may be deemed to occur upon the exercise of options to acquire capital
         stock of the Company if such Equity Interests represent a portion of
         the exercise price of such options; or

                  (vi)   cash payments, in lieu of fractional shares issuable as
         dividends on Equity Interests of the Company, in an amount, when taken
         together with all other cash payments made pursuant to this clause (vi)
         since the date of the Indenture, not to exceed $500,000.

         The Board of Directors may designate any Restricted Subsidiary to be an
Unrestricted Subsidiary if such Subsidiary, after giving effect to such
designation, would meet the requirements of the definition of "Unrestricted
Subsidiary." The Company shall not, and shall not permit any of its Subsidiaries
to, enter into, or suffer to exist, any transaction or arrangement, with a
Subsidiary that is a Restricted Subsidiary that would be inconsistent with or
violate the terms set forth in the definition of "Unrestricted Subsidiary."

         The amount of all Restricted Payments (other than cash), including the
amount of the Restricted Payment that will be deemed to occur upon the
designation of a Subsidiary as an Unrestricted Subsidiary, shall be the fair
market value on the date of the Restricted Payment of the asset(s) or securities
proposed to be transferred or issued by the Company or the applicable Restricted
Subsidiary, or of the Company's proportionate interest in the Subsidiary so to
be designated as the case may be, pursuant to the Restricted Payment.

     SECTION 4.08.    DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING
                      SUBSIDIARIES.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create or otherwise cause or suffer to
exist or become effective any consensual encumbrance or restriction on the
ability of any Restricted Subsidiary to (i) (a) pay dividends or make any other
distributions to the Company or any of its Restricted Subsidiaries (x) on its
Capital Stock or (y) with respect to any other interest or participation in, or
measured by, its profits, or (b) pay any indebtedness owed to the Company or any
of its Restricted Subsidiaries; (ii) make loans or advances to the Company or
any of its Restricted Subsidiaries; or (iii) transfer any of its properties or
assets to the Company or any of its Restricted Subsidiaries.

         However, the foregoing restrictions will not apply to encumbrances or
restrictions existing under or by reason of (a) any agreement or instrument
governing Existing Indebtedness as in effect on the Issue Date or as amended,
modified, restated or renewed in any manner not materially more restrictive,
taken as a whole, (b) the Indenture, the Notes or the Senior Credit Facility,
(c) applicable law, (d) any instrument governing Indebtedness or Capital Stock
of a
                                      -50-


Person acquired by the Company or any of its Restricted Subsidiaries as in
effect at the time of such acquisition (except to the extent such Indebtedness
was incurred in connection with or in contemplation of such acquisition), which
encumbrance or restriction is not applicable to any Person, or the properties or
assets of any Person, other than the Person, or the property or assets of the
Person, so acquired, provided that, in the case of Indebtedness, such
Indebtedness was permitted by the terms of the Indenture to be incurred, (e) by
reason of customary non-assignment provisions in leases or licenses or other
contracts entered into in the ordinary course of business, (f) purchase money
obligations for property acquired in the ordinary course of business that impose
restrictions of the nature described in clause (iii) above on the property so
acquired, (g) the provisions of agreements governing Indebtedness incurred
pursuant to clause (iv) of the second paragraph of Section 4.09, (h) any
agreement for the sale of a Restricted Subsidiary that restricts that Restricted
Subsidiary pending its sale, (i) Permitted Refinancing Indebtedness, provided
that the restrictions contained in the agreements governing such Permitted
Refinancing Indebtedness are not materially more restrictive, taken as a whole,
than those contained in the agreements governing the Indebtedness being
refinanced, (j) Liens permitted to be incurred pursuant to the provisions of
Section 4.12 that limit the right of the debtor to transfer the assets subject
to such Liens, (k) any Indebtedness incurred in compliance with Section 4.09 or
any agreement pursuant to which such Indebtedness is issued if the encumbrance
or restriction applies only in the event of a payment default or default with
respect to a financial covenant contained in the Indebtedness or agreement and
the encumbrance or restriction is not materially more disadvantageous to the
Holders of the Notes than is customary in comparable financings (as determined
by the Company) and the Company determines that any such encumbrance or
restriction will not materially affect the Company's ability to pay interest or
principal on the Notes, (l) provisions with respect to the disposition or
distribution of assets or property in joint venture agreements and other similar
agreements and (m) restrictions on cash or other deposits or net worth imposed
by customers under contracts entered into in the ordinary course of business.

     SECTION 4.09.    INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED
STOCK.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly, or indirectly, create, incur, issue, assume,
guarantee or otherwise become directly or indirectly liable, contingently or
otherwise, with respect to (collectively, "INCUR") any Indebtedness (including
Acquired Debt) and the Company will not issue any Disqualified Stock and will
not permit any of its Restricted Subsidiaries to issue any shares of preferred
stock; provided, however, that the Company may incur Indebtedness (including
Acquired Debt) or issue shares of Disqualified Stock and the Company's
Restricted Subsidiaries may incur Indebtedness or issue preferred stock if, in
each case, (1) no Default shall have occurred and be continuing or would occur
as a consequence thereof and (2) the Company's Debt to Adjusted Consolidated
Cash Flow Ratio at the time of incurrence of such Indebtedness or the issuance
of such Disqualified Stock, after giving pro forma effect to such incurrence or
issuance as of such date and to the use of proceeds therefrom would have been no
greater than 7.0 to 1.0.

         The first paragraph of this covenant shall not apply to the incurrence
of any of the following items of Indebtedness (collectively, "PERMITTED DEBT")
if no Default shall have occurred and be continuing or would occur as a
consequence thereof:

                                      -51-


                  (i)    the incurrence by the Company or any of its Restricted
         Subsidiaries of Indebtedness under one or more Credit Facilities or
         through the issuance of Seller Paper in an aggregate principal amount
         (with letters of credit being deemed to have an aggregate principal
         amount equal to the maximum potential liability of the Company and its
         Restricted Subsidiaries thereunder) at any one time outstanding not to
         exceed the greater of (A) $300.0 million or (B) the product of $150,000
         times the number of Completed Towers on the date of such occurrence
         less, in either such case, the aggregate amount of commitment
         reductions under Credit Facilities resulting from the application of
         proceeds of Asset Sales since the Issue Date; provided, however, that
         the aggregate principal amount of Seller Paper at any one time
         outstanding under this clause (i) shall not exceed $50.0 million;

                  (ii)   the incurrence by the Company and its Restricted
         Subsidiaries of the Existing Indebtedness;

                  (iii)  the incurrence by the Company of Indebtedness
         represented by the Notes issued on the Issue Date, and the New Notes;

                  (iv)   the incurrence by the Company or any of its Restricted
         Subsidiaries of Indebtedness represented by Capital Lease Obligations,
         mortgage financings or purchase money obligations, in each case,
         incurred for the purpose of financing all or any part of the purchase
         price or cost of construction or improvement of property, plant or
         equipment used in the business of the Company or such Restricted
         Subsidiary, in an aggregate principal amount, including all Permitted
         Refinancing Indebtedness incurred to refund, refinance or replace any
         other Indebtedness incurred pursuant to this clause (iv), not to exceed
         $10.0 million at any one time outstanding;

                  (v)    the incurrence by the Company or any of its Restricted
         Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or
         the net proceeds of which are used to extend, refinance, renew,
         replace, defease or refund, Indebtedness (other than intercompany
         Indebtedness) that was permitted by the Indenture to be incurred under
         the first paragraph hereof or clause (ii) or (iii) or this clause (v)
         of this paragraph;

                  (vi)   the incurrence by the Company or any of its Restricted
         Subsidiaries of intercompany Indebtedness or intercompany preferred
         stock between or among the Company and any of its Restricted
         Subsidiaries; provided, however, that (1) if the Company is the obligor
         on such Indebtedness, such Indebtedness is expressly subordinated to
         the prior payment in full in cash of all Obligations with respect to
         the Notes and (2)(A) any subsequent issuance or transfer of Equity
         Interests that results in any such Indebtedness or preferred stock
         being held by a Person other than the Company or a Restricted
         Subsidiary and (B) any sale or other transfer of any such Indebtedness
         or preferred stock to a Person that is not either the Company or a
         Restricted Subsidiary shall be deemed, in each case, to constitute an
         incurrence of such Indebtedness or preferred stock by the Company or
         such Restricted Subsidiary, as the case may be;

                                      -52-


                  (vii)  the incurrence by the Company or any of its Restricted
         Subsidiaries of Hedging Obligations that are incurred for the purpose
         of fixing or hedging interest rate risk with respect to any floating
         rate Indebtedness that is permitted by the terms of the Indenture to be
         outstanding or currency exchange risk or otherwise entered into for
         bona fide purposes designed to protect against interest rate or
         currency exchange risk and not for speculative purposes;

                  (viii) the guarantee by the Company or any of its Restricted
         Subsidiaries of Indebtedness of the Company or a Restricted Subsidiary
         of the Company that was permitted to be incurred by another provision
         of the Indenture;

                  (ix)   the incurrence by the Company or any of its Restricted
         Subsidiaries of Acquired Debt in connection with the acquisition of
         assets or a new Subsidiary and the incurrence by the Company's
         Restricted Subsidiaries of Indebtedness as a result of the designation
         of an Unrestricted Subsidiary as a Restricted Subsidiary; provided
         that, in the case of any such incurrence of Acquired Debt, such
         Acquired Debt was incurred by the prior owner of such assets or such
         Restricted Subsidiary prior to such acquisition by the Company or one
         of its Restricted Subsidiaries and was not incurred in connection with,
         or in contemplation of, such acquisition by the Company or one of its
         Restricted Subsidiaries; and provided further that, in the case of any
         incurrence pursuant to this clause (ix), as a result of such
         acquisition the Company's Debt to Adjusted Consolidated Cash Flow Ratio
         at the time of incurrence of such Acquired Debt, after giving pro forma
         effect to such incurrence as if the same had occurred at the beginning
         of the most recently ended four full fiscal quarter period for the
         Company for which internal financial statements are available, would
         have been less than the Company's Debt to Adjusted Consolidated Cash
         Flow Ratio for the same period without giving pro forma effect to such
         incurrence;

                  (x)    the incurrence by the Company of Indebtedness not to
         exceed, at any one time outstanding, the sum of (A) 2.0 times the
         aggregate net cash proceeds plus (B) 1.0 times the fair market value of
         non-cash proceeds (evidenced by a resolution of the Board of Directors
         of the Company set forth in an Officers' Certificate delivered to the
         Trustee) from the issuance and sale, other than to a Subsidiary, of
         Qualified Equity Interests of the Company since the beginning of the
         fiscal quarter during which the March 1998 Senior Discount Note
         Indenture was executed (less the amount of such proceeds used to make
         Restricted Payments as provided in clause (c)(2) of the first paragraph
         or clause (iv) of the second paragraph of Section 4.07;

                  (xi)   the issuance by Restricted Subsidiaries of Permitted
         Subsidiary Equity Interests; and

                  (xii)  the incurrence by the Company or any of its Restricted
         Subsidiaries of additional Indebtedness in an aggregate principal
         amount (or accreted value, as applicable) at any time outstanding not
         to exceed $10.0 million.

         (1) The Company shall not incur any Indebtedness that is contractually
subordinated in right of payment to any other Indebtedness of the Company unless
such

                                      -53-


Indebtedness is also contractually subordinated in right of payment to the Notes
on substantially identical terms; provided, however, that no Indebtedness of the
Company shall be deemed to be contractually subordinated in right of payment to
any other Indebtedness of the Company solely by virtue of being unsecured; and
(2) the Company shall not permit any of its Unrestricted Subsidiaries to incur
any Indebtedness other than Non-Recourse Debt; and (3) Restricted Subsidiaries
may not issue or sell, and the Company may not permit any Restricted Subsidiary
to have outstanding, any Equity Interests (other than (x) Equity Interests held
by the Company or its Restricted Subsidiaries or (y) Permitted Subsidiary Equity
Interests).

         For purposes of determining compliance with this Section 4.09, in the
event that an item of Indebtedness or preferred stock meets the criteria of more
than one of the categories of Permitted Debt described in clauses (i) through
(xii) in the second paragraph of this Section 4.09 or is entitled to be incurred
pursuant to the first paragraph of this Section 4.09, the Company shall, in its
sole discretion, classify or reclassify such item of Indebtedness in any manner
that complies with this Section 4.09. Accrual of interest, accretion or
amortization of original issue discount and the payment of interest in the form
of additional Indebtedness will not be deemed to be an incurrence of
Indebtedness for purposes of this covenant.

     SECTION 4.10.    ASSET SALES.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, consummate an Asset Sale unless (i) the Company (or the
Restricted Subsidiary, as the case may be) receives consideration at the time of
such Asset Sale at least equal to the fair market value (evidenced by a
resolution of the Board of Directors set forth in an Officers' Certificate
delivered to the Trustee) of the assets or Equity Interests issued or sold or
otherwise disposed of and (ii) at least 75% of the consideration therefore
received by the Company or such Restricted Subsidiary is in the form of (a) cash
or Cash Equivalents, (b) Tower Assets or (c) any combination of the foregoing;
provided that the amount of (x) any liabilities (as shown on the Company's or
such Restricted Subsidiary's most recent balance sheet) of the Company or any
Restricted Subsidiary (other than contingent liabilities and liabilities that
are by their terms subordinated to the Notes or any guarantee thereof) that are
assumed by the transferee of any such assets pursuant to a customary novation
agreement that releases the Company or such Restricted Subsidiary from further
liability and (y) any securities, notes or other obligations received by the
Company or any such Restricted Subsidiary from such transferee that are
converted by the Company or such Restricted Subsidiary into cash within 20 days
of the applicable Asset Sale (to the extent of the cash received), shall be
deemed to be cash for purposes of this provision.

         Within 360 days after the receipt of any Net Proceeds from an Asset
Sale, the Company or the applicable Restricted Subsidiary may apply such Net
Proceeds to: (a) reduce (which reduction may be temporary) Indebtedness under a
Credit Facility; (b) reduce other Indebtedness of any of the Company's
Restricted Subsidiaries; (c) acquire all or substantially all the assets of a
Permitted Business; (d) acquire Voting Stock of a Permitted Business from a
Person that is not a Subsidiary of the Company; provided, that, after giving
effect thereto, the Company or its Restricted Subsidiary owns a majority of such
Voting Stock; or (e) make a capital expenditure or acquire other long-term
assets that are used or useful in a Permitted Business. Pending the final
application of any such Net Proceeds, the Company may invest such

                                      -54-


Net Proceeds in any manner that is not prohibited by the Indenture. Any Net
Proceeds from Asset Sales that are not applied or invested as provided in the
first sentence of this paragraph will be deemed to constitute "EXCESS PROCEEDS."
When the aggregate amount of Excess Proceeds exceeds $10.0 million, the Company
will be required to make an offer (an "ASSET SALE OFFER") to all Holders of
Notes and all holders of other senior Indebtedness of the Company containing
provisions similar to those set forth in this Indenture with respect to offers
to purchase or redeem with the proceeds of sales of assets (such other Senior
Indebtedness of the Company, "PARI PASSU NOTES") to purchase, on a pro rata
basis, the maximum principal amount (or accreted value, as applicable) of Notes
and such other senior Indebtedness of the Company that may be purchased out of
the Excess Proceeds, at an offer price in cash in an amount equal to 100% of the
principal amount (or accreted value, as applicable) thereof plus accrued and
unpaid interest thereon, if any, to the date of purchase (subject to the right
of Holders of record on the relevant record date to receive interest due on the
relevant interest payment date), in accordance with the procedures set forth in
the Indenture and such other senior Indebtedness of the Company. To the extent
that any Excess Proceeds remain after consummation of an Asset Sale Offer, the
Company may use such Excess Proceeds for any purpose not otherwise prohibited by
this Indenture. If the aggregate principal amount of Notes and such other senior
Indebtedness of the Company tendered into such Asset Sale Offer surrendered by
Holders thereof exceeds the amount of Excess Proceeds, the Trustee shall select
the Notes and such other senior Indebtedness to be purchased on a pro rata
basis. Upon completion of such offer to purchase, the amount of Excess Proceeds
shall be reset at zero.

     SECTION 4.11.    TRANSACTIONS WITH AFFILIATES.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise
dispose of any of its properties or assets to, or purchase any property or
assets from, or enter into or make or amend any transaction, contract,
agreement, understanding, loan, advance or Guarantee with, or for the benefit
of, any Affiliate (each of the foregoing, an "AFFILIATE TRANSACTION"), unless
(i) such Affiliate Transaction is on terms that are no less favorable to the
Company or the relevant Restricted Subsidiary than those that would have been
obtained in a comparable transaction by the Company or such Restricted
Subsidiary with an unrelated Person and (ii) the Company delivers to the Trustee
(a) with respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $2.0 million, a
resolution of the Board of Directors set forth in an Officers' Certificate
certifying that such Affiliate Transaction complies with clause (i) above and
that such Affiliate Transaction has been approved by a majority of the
disinterested members of the Board of Directors and (b) with respect to any
Affiliate Transaction or series of related Affiliate Transactions involving
aggregate consideration in excess of $10.0 million, an opinion as to the
fairness to the Holders of such Affiliate Transaction from a financial point of
view issued by an accounting, appraisal or investment banking firm of national
standing. Notwithstanding the foregoing, the following items shall not be deemed
to be Affiliate Transactions: (i) any employment arrangements with any executive
officer of the Company or a Restricted Subsidiary that is entered into by the
Company or any of its Restricted Subsidiaries in the ordinary course of business
and consistent with compensation arrangements of similarly situated executive
officers at comparable companies engaged in Permitted Businesses, (ii)
transactions between or among the Company and/or its Restricted Subsidiaries,
(iii) payment of outside directors' fees in an aggregate annual amount not to
exceed

                                      -55-


$50,000 per Person, (iv) Restricted Payments and Permitted Investments that are
permitted by Section 4.07 and (v) the issuance or sale of Equity Interests
(other than Disqualified Stock) of the Company.

     SECTION 4.12.    LIENS.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, assume or suffer to
exist any Lien securing Indebtedness or trade payables on any asset now owned or
hereafter acquired, or any income or profits therefrom or assign or convey any
right to receive income therefrom, except Permitted Liens.

     SECTION 4.13.    BUSINESS ACTIVITIES.

         The Company shall not, and shall not permit any Restricted Subsidiary
to, engage in any business other than Permitted Businesses, except to such
extent as would not be material to the Company and its Restricted Subsidiaries
taken as a whole.

     SECTION 4.14.    CORPORATE EXISTENCE.

         Subject to Article 5 hereof, the Company shall do or cause to be done
all things necessary to preserve and keep in full force and effect (i) its
corporate existence, and the corporate, partnership or other existence of each
of its Restricted Subsidiaries, in accordance with the respective organizational
documents (as the same may be amended from time to time) of the Company or any
such Restricted Subsidiary and (ii) the rights (charter and statutory), licenses
and franchises of the Company and its Subsidiaries; provided, however, that the
Company shall not be required to preserve any such right, license or franchise,
or the corporate, partnership or other existence of any of its Restricted
Subsidiaries, if the Board of Directors shall determine that the preservation
thereof is no longer desirable in the conduct of the business of the Company and
its Restricted Subsidiaries, taken as a whole, and that the loss thereof is not
adverse in any material respect to the Holders of the Notes.

     SECTION 4.15.    OFFER TO REPURCHASE UPON CHANGE OF CONTROL.

         (a) Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to purchase all or any part (equal
to $1,000 or an integral multiple thereof) of such Holder's Notes pursuant to
the offer described below (the "CHANGE OF CONTROL OFFER") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest thereon, if any (subject to the right of Holders of record on
the relevant record date to receive interest due on the relevant interest
payment date), to the date of purchase (the "CHANGE OF CONTROL PAYMENT"). Within
30 days following any Change of Control, the Company shall mail a notice to each
Holder stating: (i) that the Change of Control Offer is being made pursuant to
this Section 4.15 and that all Notes tendered will be accepted for payment; (ii)
the purchase price and the purchase date, which shall be no earlier than 30
business days and no later than 60 days from the date such notice is mailed (the
"CHANGE OF CONTROL PAYMENT DATE"); (iii) that any Note not tendered will
continue to accrue interest; (iv) that, unless the Company defaults in the
payment of the Change of Control Payment, all Notes accepted for payment
pursuant to the Change of Control Offer shall cease to accrue interest after the
Change of Control Payment Date; (v) that Holders electing to have any Notes
purchased pursuant to a

                                      -56-


Change of Control Offer will be required to surrender the Notes, with the form
entitled "Option of Holder to Elect Purchase" on the reverse of the Notes
completed, to the Paying Agent at the address specified in the notice prior to
the close of business on the third Business Day preceding the Change of Control
Payment Date; (vi) that Holders will be entitled to withdraw their election if
the Paying Agent receives, not later than the close of business on the second
Business Day preceding the Change of Control Payment Date, a telegram, telex,
facsimile transmission or letter setting forth the name of the Holder, the
principal amount of Notes delivered for purchase, and a statement that such
Holder is withdrawing his election to have the Notes purchased; and (vii) that
Holders whose Notes are being purchased only in part will be issued new Notes
equal in principal amount to the unpurchased portion of the Notes surrendered,
which unpurchased portion must be equal to $1,000 in principal amount or an
integral multiple thereof.

         (b) On the Change of Control Payment Date, the Company shall, to the
extent lawful, (i) accept for payment all Notes or portions thereof properly
tendered pursuant to the Change of Control Offer, (ii) deposit with the Paying
Agent an amount equal to the Change of Control Payment in respect of all Notes
or portions thereof so tendered and (iii) deliver or cause to be delivered to
the Trustee the Notes so accepted together with an Officers' Certificate stating
the aggregate principal amount of Notes or portions thereof being purchased by
the Company. The Paying Agent shall promptly mail to each Holder of Notes so
tendered the Change of Control Payment for such Notes, and the Trustee shall
promptly authenticate and mail (or cause to be transferred by book entry) to
each Holder a new Note equal in principal amount to any unpurchased portion of
the Notes surrendered, if any; provided that each such new Note shall be in a
principal amount of $1,000 or an integral multiple thereof.

         (c) The Company shall not be required to make a Change of Control Offer
upon a Change of Control if a third party makes the Change of Control Offer in
the manner, at the times and otherwise in compliance with the requirements set
forth in this Indenture applicable to a Change of Control Offer made by the
Company and purchases all Notes validly tendered and not withdrawn under such
Change of Control Offer. The provisions under this Indenture relative to the
Company's obligation to make an offer to repurchase the Notes as a result of a
Change of Control may be waived or modified with the written consent of the
Holders of a majority in principal amount of the Notes then outstanding.

         (d) The Company shall comply, to the extent applicable, with the
requirements of Section 14(e) of the Exchange Act and any other securities laws
or regulations applicable to any Change of Control Offer. To the extent that the
provisions of any such securities laws or securities regulations conflict with
the provisions of the covenant described above, the Company shall comply with
the applicable securities laws and regulations and shall not be deemed to have
breached its obligations under the covenant described above by virtue thereof.

     SECTION 4.16.    LIMITATION ON SALE AND LEASEBACK TRANSACTIONS.

         The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, enter into any sale and leaseback transaction (as seller);
provided that the Company or any of its Restricted Subsidiaries may enter into a
sale and leaseback transaction if (i) the Company or such Restricted Subsidiary,
as applicable, could have (a) incurred Indebtedness in an amount

                                      -57-


equal to the Attributable Debt relating to such sale and leaseback transaction
pursuant to the Debt to Adjusted Consolidated Cash Flow Ratio test set forth in
the first paragraph of Section 4.09 and (b) incurred a Lien to secure such
Indebtedness pursuant to Section 4.12, (ii) the gross cash proceeds of such sale
and leaseback transaction are at least equal to the fair market value (as
determined in good faith by the Board of Directors) of the property that is the
subject of such sale and leaseback transaction and (iii) the transfer of assets
in such sale and leaseback transaction is permitted by, and the Company applies
the proceeds of such transaction in compliance with, Section 4.10.

     SECTION 4.17.    [RESERVED]

     SECTION 4.18.    LIMITATION ON ISSUANCES OF GUARANTEES OF INDEBTEDNESS.

         The Company will not permit any Restricted Subsidiary, directly or
indirectly, to Guarantee or pledge any assets to secure the payment of any
Indebtedness of the Company (except Indebtedness of the Company under a
guarantee of Indebtedness of one or more of its Restricted Subsidiaries) unless
such Restricted Subsidiary simultaneously executes and delivers a supplemental
indenture to this Indenture providing for the Guarantee ("Subsidiary Guarantee")
of the payment of the Notes by such Restricted Subsidiary, which Guarantee shall
be senior to or pari passu with such Restricted Subsidiary's Guarantee of or
pledge to secure such other Indebtedness. Notwithstanding the foregoing, any
such Guarantee by a Restricted Subsidiary of the Notes shall provide by its
terms that it shall be automatically and unconditionally released and discharged
upon any sale, exchange or transfer, to any Person other than a Restricted
Subsidiary, of all of the Company's stock in, or all or substantially all the
assets of, such Restricted Subsidiary, which sale, exchange or transfer is made
in compliance with the applicable provisions of the Indenture. The form of such
supplemental indenture providing for the Guarantee is attached as Exhibit E
hereto.

                                   ARTICLE 5.
                                   SUCCESSORS

     SECTION 5.01.    MERGER, CONSOLIDATION OR SALE OF ASSETS.

         The Company may not consolidate or merge with or into (whether or not
the Company is the surviving corporation), or sell, assign, transfer, lease,
convey or otherwise dispose of all or substantially all of its properties or
assets in one or more related transactions to another corporation, Person or
entity unless (i) the Company is the surviving corporation or the entity or the
Person formed by or surviving any such consolidation or merger (if other than
the Company) or to which such sale, assignment, transfer, lease, conveyance or
other disposition shall have been made is a corporation organized or existing
under the laws of the United States, any state thereof or the District of
Columbia; (ii) the entity or Person formed by or surviving any such
consolidation or merger (if other than the Company) or the entity or Person to
which such sale, assignment, transfer, lease, conveyance or other disposition
shall have been made assumes all the obligations of the Company under the Notes
and this Indenture pursuant to a supplemental indenture in a form reasonably
satisfactory to the Trustee; (iii) in the case of a transaction involving the
Company, immediately after giving effect to such transaction and the use of any

                                      -58-


net proceeds therefrom, on a pro forma basis, the Consolidated Net Worth of the
Company or the successor, as the case may be, would be at least equal to the
Consolidated Net Worth of the Company immediately prior to such transaction
(exclusive of any adjustments to Consolidated Net Worth attributable to
transaction costs) less any amount treated as a Restricted Payment in connection
with such transaction in accordance with this Indenture; and (iv) immediately
before and after such transaction no Default exists.

     SECTION 5.02.    SUCCESSOR CORPORATION SUBSTITUTED.

         Upon any consolidation or merger, or any sale, assignment, transfer,
lease, conveyance or other disposition of all or substantially all of the assets
of the Company in accordance with Section 5.01 hereof, the successor corporation
formed by such consolidation or into or with which the Company is merged or to
which such sale, assignment, transfer, lease, conveyance or other disposition is
made shall succeed to, and be substituted for (so that from and after the date
of such consolidation, merger, sale, lease, conveyance or other disposition, the
provisions of this Indenture referring to "the Company" shall refer instead to
the successor corporation and not to the Company), and may exercise every right
and power of the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein, provided, however, that
the predecessor company shall not be relieved from the obligation to pay the
principal of and interest on the Notes except in the case of a sale of all of
the Company's assets that meets the requirements of Section 5.01 hereof.

                                   ARTICLE 6.
                              DEFAULTS AND REMEDIES

     SECTION 6.01.    EVENTS OF DEFAULT.

         An "Event of Default" occurs if:

         (a) the Company defaults in the payment when due of interest on the
Notes and such default continues for a period of 30 days;

         (b) the Company defaults in the payment when due of principal of or
premium, if any, on the Notes when the same becomes due and payable at maturity,
upon redemption (including in connection with an offer to purchase) or
otherwise;

         (c) the Company fails to comply with any of the provisions of Section
4.10, 4.15 or 5.01 hereof;

         (d) the Company fails to observe or perform any other covenant,
representation, warranty or other agreement in this Indenture or the Notes for
30 days after notice to the Company by the Trustee or the Holders of at least
25% in aggregate principal amount of the Notes then outstanding voting as a
single class;

                                      -59-


         (e) a default occurs under any mortgage, indenture or instrument under
which there may be issued or by which there may be secured or evidenced any
Indebtedness for money borrowed by the Company or any of its Significant
Subsidiaries (or the payment of which is guaranteed by the Company or any of its
Significant Subsidiaries), whether such Indebtedness or guarantee now exists, or
is created after the date of this Indenture, which default (a) is caused by a
failure to pay principal of or premium, if any, or interest on such Indebtedness
prior to the expiration of the grace period provided in such Indebtedness on the
date of such default (a "Payment Default") or (b) results in the acceleration of
such Indebtedness prior to its express maturity and, in each case, the principal
amount of such Indebtedness, together with the principal amount of any other
such Indebtedness under which there has been a Payment Default or the maturity
of which has been so accelerated, aggregates $10.0 million or more;

         (f) a final judgment or final judgments for the payment of money are
entered by a court or courts of competent jurisdiction against the Company or
any of its Significant Subsidiaries or any group of Subsidiaries that, taken as
a whole, would constitute a Significant Subsidiary and such judgment or
judgments remain undischarged for a period (during which execution shall not be
effectively stayed) of 60 days; provided that the aggregate of all such
undischarged judgments exceeds $10.0 million;

         (g) the Company or any of its Restricted Subsidiaries that is a
Significant Subsidiary pursuant to or within the meaning of Bankruptcy Law:

                  (i)    commences a voluntary case,

                  (ii)   consents to the entry of an order for relief against it
         in an involuntary case,

                  (iii)  consents to the appointment of a Custodian of it or for
         all or substantially all of its property,

                  (iv)   makes a general assignment for the benefit of its
         creditors, or

                  (v)    generally is not paying its debts as they become due;
         or

         (h) a court of competent jurisdiction enters an order or decree under
any Bankruptcy Law that:

                  (i)    is for relief against the Company or any Restricted
         Subsidiary that is a Significant Subsidiary in an involuntary case;

                  (ii)   appoints a Custodian of the Company or any Restricted
         Subsidiary that is a Significant Subsidiary or for all or substantially
         all of the property of the Company or any Restricted Subsidiary that is
         a Significant Subsidiary; or

                                      -60-


                  (iii)  orders the liquidation of the Company or any Restricted
         Subsidiary that is a Significant Subsidiary; and the order or decree
         remains unstayed and in effect for 60 consecutive days.

     SECTION 6.02.    ACCELERATION.

         If any Event of Default (other than an Event of Default specified in
clause (g) or (h) of Section 6.01 hereof with respect to the Company, any
Significant Subsidiary or any group of Significant Subsidiaries that, taken as a
whole, would constitute a Significant Subsidiary) occurs and is continuing, the
Trustee or the Holders of at least 25% in principal amount of the then
outstanding Notes may declare all the Notes to be due and payable immediately.
Upon any such declaration, the principal of and accrued and unpaid interest, if
any, shall become due and payable immediately. Notwithstanding the foregoing, if
an Event of Default specified in clause (g) or (h) of Section 6.01 hereof occurs
with respect to the Company, any of its Significant Subsidiaries or any group of
Subsidiaries that, taken as a whole, would constitute a Significant Subsidiary,
shall be due and payable immediately without further action or notice. The
Holders of a majority in aggregate principal amount of the then outstanding
Notes by written notice to the Trustee may on behalf of all of the Holders
rescind an acceleration and its consequences if the rescission would not
conflict with any judgment or decree and if all existing Events of Default
(except nonpayment of principal, interest or premium that has become due solely
because of the acceleration) have been cured or waived.

     SECTION 6.03.    OTHER REMEDIES.

         If an Event of Default occurs and is continuing, the Trustee may pursue
any available remedy to collect the payment of principal, premium, if any,
interest and liquidated damages, if any, on the Notes or to enforce the
performance of any provision of the Notes or this Indenture.

         The Trustee may maintain a proceeding even if it does not possess any
of the Notes or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder of a Note in exercising any right or
remedy accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default. All remedies are
cumulative to the extent permitted by law.

     SECTION 6.04.    WAIVER OF PAST DEFAULTS.

         Holders of not less than a majority in aggregate principal amount of
the then outstanding Notes by notice to the Trustee may on behalf of the Holders
of all of the Notes waive an existing Default or Event of Default and its
consequences hereunder, except a continuing Default or Event of Default in the
payment of the principal of, premium, if any, or interest on, the Notes
(including in connection with an offer to purchase) (PROVIDED, HOWEVER, that the
Holders of a majority in aggregate principal amount of the then outstanding
Notes may rescind an acceleration and its consequences, including any related
payment default that resulted from such acceleration). Upon any such waiver,
such Default shall cease to exist, and any Event of Default arising therefrom
shall be deemed to have been cured for every purpose of this

                                      -61-


Indenture; but no such waiver shall extend to any subsequent or other Default or
impair any right consequent thereon.

     SECTION 6.05.    CONTROL BY MAJORITY.

         Holders of a majority in principal amount of the then outstanding Notes
may direct the time, method and place of conducting any proceeding for
exercising any remedy available to the Trustee or exercising any trust or power
conferred on it. However, the Trustee may refuse to follow any direction that
conflicts with law or this Indenture that the Trustee determines may be unduly
prejudicial to the rights of other Holders of Notes or that may involve the
Trustee in personal liability.

     SECTION 6.06.    LIMITATION ON SUITS.

         A Holder of a Note may pursue a remedy with respect to this Indenture
or the Notes only if:

                  (a) the Holder of a Note gives to the Trustee written notice
         of a continuing Event of Default;

                  (b) the Holders of at least 25% in principal amount of the
         then outstanding Notes make a written request to the Trustee to pursue
         the remedy;

                  (c) such Holder of a Note or Holders of Notes offer and, if
         requested, provide to the Trustee indemnity satisfactory to the Trustee
         against any loss, liability or expense;

                  (d) the Trustee does not comply with the request within 60
         days after receipt of the request and the offer and, if requested, the
         provision of indemnity; and

                  (e) during such 60-day period the Holders of a majority in
         principal amount of the then outstanding Notes do not give the Trustee
         a direction inconsistent with the request.

         A Holder of a Note may not use this Indenture to prejudice the rights
of another Holder of a Note or to obtain a preference or priority over another
Holder of a Note.

     SECTION 6.07.    RIGHTS OF HOLDERS OF NOTES TO RECEIVE PAYMENT.

         Notwithstanding any other provision of this Indenture, the right of any
Holder of a Note to receive payment of principal, premium and Liquidated
Damages, if any, and interest on the Note, on or after the respective due dates
expressed in the Note (including in connection with an offer to purchase), or to
bring suit for the enforcement of any such payment on or after such respective
dates, shall not be impaired or affected without the consent of such Holder.

     SECTION 6.08.    COLLECTION SUIT BY TRUSTEE.

         If an Event of Default specified in Section 6.01(a) or (b) occurs and
is continuing, the Trustee is authorized to recover judgment in its own name and
as trustee of an express trust

                                      -62-


against the Company for the whole amount of principal of, premium and liquidated
damages, if any, and interest remaining unpaid on the Notes and interest on
overdue principal and, to the extent lawful, interest and such further amount as
shall be sufficient to cover the costs and expenses of collection, including the
reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel.

     SECTION 6.09.    TRUSTEE MAY FILE PROOFS OF CLAIM.

         The Trustee is authorized to file such proofs of claim and other papers
or documents as may be necessary or advisable in order to have the claims of the
Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel) and the
Holders of the Notes allowed in any judicial proceedings relative to the Company
(or any other obligor upon the Notes), its creditors or its property and shall
be entitled and empowered to collect, receive and distribute any money or other
property payable or deliverable on any such claims and any custodian in any such
judicial proceeding is hereby authorized by each Holder to make such payments to
the Trustee, and in the event that the Trustee shall consent to the making of
such payments directly to the Holders, to pay to the Trustee any amount due to
it for the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 7.07 hereof. To the extent that the payment of any such compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and
any other amounts due the Trustee under Section 7.07 hereof out of the estate in
any such proceeding, shall be denied for any reason, payment of the same shall
be secured by a Lien on, and shall be paid out of, any and all distributions,
dividends, money, securities and other properties that the Holders may be
entitled to receive in such proceeding whether in liquidation or under any plan
of reorganization or arrangement or otherwise. Nothing herein contained shall be
deemed to authorize the Trustee to authorize or consent to or accept or adopt on
behalf of any Holder any plan of reorganization, arrangement, adjustment or
composition affecting the Notes or the rights of any Holder, or to authorize the
Trustee to vote in respect of the claim of any Holder in any such proceeding.

     SECTION 6.10.    PRIORITIES.

         If the Trustee collects any money pursuant to this Article, it shall
pay out the money in the following order:

                  First: to the Trustee, its agents and attorneys for amounts
         due under Section 7.07 hereof, including payment of all compensation,
         expense and liabilities incurred, and all advances made, by the Trustee
         and the costs and expenses of collection;

                  Second: to Holders of Notes for amounts due and unpaid on the
         Notes for principal, premium and liquidated damages, if any, and
         interest, ratably, without preference or priority of any kind,
         according to the amounts due and payable on the Notes for principal,
         premium and liquidated damages, if any and interest, respectively; and

                                      -63-


                  Third: to the Company or to such party as a court of competent
         jurisdiction shall direct.

                  The Trustee may fix a record date and payment date for any
         payment to Holders of Notes pursuant to this Section 6.10.

     SECTION 6.11.    UNDERTAKING FOR COSTS.

         In any suit for the enforcement of any right or remedy under this
Indenture or in any suit against the Trustee for any action taken or omitted by
it as a Trustee, a court in its discretion may require the filing by any party
litigant in the suit of an undertaking to pay the costs of the suit, and the
court in its discretion may assess reasonable costs, including reasonable
attorneys' fees, against any party litigant in the suit, having due regard to
the merits and good faith of the claims or defenses made by the party litigant.
This Section does not apply to a suit by the Trustee, a suit by a Holder of a
Note pursuant to Section 6.07 hereof, or a suit by Holders of more than 10% in
principal amount of the then outstanding Notes.

                                   ARTICLE 7.
                                     TRUSTEE

     SECTION 7.01.    DUTIES OF TRUSTEE.

         (a) If an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in its exercise, as a prudent person would
exercise or use under the circumstances in the conduct of such person's own
affairs.

         (b) Except during the continuance of an Event of Default:

                  (i)    the duties of the Trustee shall be determined solely by
         the express provisions of this Indenture and the Trustee need perform
         only those duties that are specifically set forth in this Indenture and
         no others, and no implied covenants or obligations shall be read into
         this Indenture against the Trustee; and

                  (ii)   in the absence of bad faith on its part, the Trustee
         may conclusively rely, as to the truth of the statements and the
         correctness of the opinions expressed therein, upon certificates or
         opinions furnished to the Trustee and conforming to the requirements of
         this Indenture. However, the Trustee shall examine the certificates and
         opinions to determine whether or not they conform to the requirements
         of this Indenture.

         (c) The Trustee may not be relieved from liabilities for its own
negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

                  (iii)  this paragraph does not limit the effect of paragraph
         (b) of this Section;

                                      -64-


                  (iv)   the Trustee shall not be liable for any error of
         judgment made in good faith by a Responsible Officer, unless it is
         proved that the Trustee was negligent in ascertaining the pertinent
         facts; and

                  (v)    the Trustee shall not be liable with respect to any
         action it takes or omits to take in good faith in accordance with a
         direction received by it pursuant to Section 6.05 hereof.

         (d) Whether or not therein expressly so provided, every provision of
this Indenture that in any way relates to the Trustee is subject to paragraphs
(a), (b), and (c) of this Section.

         (e) No provision of this Indenture shall require the Trustee to expend
or risk its own funds or incur any liability. The Trustee shall be under no
obligation to exercise any of its rights and powers under this Indenture at the
request of any Holders, unless such Holder shall have offered to the Trustee
security and indemnity satisfactory to it against any loss, liability or
expense.

         (f) The Trustee shall not be liable for interest on any money received
by it except as the Trustee may agree in writing with the Company. Money held in
trust by the Trustee need not be segregated from other funds except to the
extent required by law.

     SECTION 7.02.    RIGHTS OF TRUSTEE.

         (a) The Trustee may conclusively rely upon any document believed by it
to be genuine and to have been signed or presented by the proper Person. The
Trustee need not investigate any fact or matter stated in the document.

         (b) Before the Trustee acts or refrains from acting, it may require an
Officers' Certificate or an Opinion of Counsel or both. The Trustee shall not be
liable for any action it takes or omits to take in good faith in reliance on
such Officers' Certificate or Opinion of Counsel. The Trustee may consult with
counsel and the written advice of such counsel or any Opinion of Counsel shall
be full and complete authorization and protection from liability in respect of
any action taken, suffered or omitted by it hereunder in good faith and in
reliance thereon.

         (c) The Trustee may act through its attorneys and agents and shall not
be responsible for the misconduct or negligence of any agent appointed with due
care.

         (d) The Trustee shall not be liable for any action it takes or omits to
take in good faith that it believes to be authorized or within the rights or
powers conferred upon it by this Indenture.

         (e) Unless otherwise specifically provided in this Indenture, any
demand, request, direction or notice from the Company shall be sufficient if
signed by an Officer of the Company.

                                      -65-


         (f) The Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction of
any of the Holders unless such Holders shall have offered to the Trustee
reasonable security or indemnity against the costs, expenses and liabilities
that might be incurred by it in compliance with such request or direction.

     SECTION 7.03.    INDIVIDUAL RIGHTS OF TRUSTEE.

         The Trustee in its individual or any other capacity may become the
owner or pledgee of Notes and may otherwise deal with the Company or any
Affiliate of the Company with the same rights it would have if it were not
Trustee. However, in the event that the Trustee acquires any conflicting
interest it must eliminate such conflict within 90 days, apply to the SEC for
permission to continue as trustee or resign. Any Agent may do the same with like
rights and duties. The Trustee is also subject to Sections 7.10 and 7.11 hereof.

     SECTION 7.04.    TRUSTEE'S DISCLAIMER.

         The Trustee shall not be responsible for and makes no representation as
to the validity or adequacy of this Indenture or the Notes, it shall not be
accountable for the Company's use of the proceeds from the Notes or any money
paid to the Company or upon the Company's direction under any provision of this
Indenture, it shall not be responsible for the use or application of any money
received by any Paying Agent other than the Trustee, and it shall not be
responsible for any statement or recital herein or any statement in the Notes or
any other document in connection with the sale of the Notes or pursuant to this
Indenture other than its certificate of authentication.

     SECTION 7.05.    NOTICE OF DEFAULTS.

         If a Default or Event of Default occurs and is continuing and if it is
known to the Trustee, the Trustee shall mail to Holders of Notes a notice of the
Default or Event of Default within 90 days after it occurs. Except in the case
of a Default or Event of Default in payment of principal of, premium, if any, or
interest on any Note, the Trustee may withhold the notice if and so long as a
committee of its Responsible Officers in good faith determines that withholding
the notice is in the interests of the Holders of the Notes.

     SECTION 7.06.    REPORTS BY TRUSTEE TO HOLDERS OF THE NOTES.

         Within 60 days after each May 15 beginning with the May 15 following
the date of this Indenture, and for so long as Notes remain outstanding, the
Trustee shall mail to the Holders of the Notes a brief report dated as of such
reporting date that complies with TIA ss. 313(a) (but if no event described in
TIA ss. 313(a) has occurred within the twelve months preceding the reporting
date, no report need be transmitted). The Trustee also shall comply with TIA ss.
313(b)(2). The Trustee shall also transmit by mail all reports as required by
TIA ss. 313(c).

         A copy of each report at the time of its mailing to the Holders of
Notes shall be mailed to the Company and filed with the SEC and each stock
exchange on which the Notes are listed in accordance with TIA ss. 313(d). The
Company shall promptly notify the Trustee when the Notes are listed on any stock
exchange.

                                      -66-


     SECTION 7.07.    COMPENSATION AND INDEMNITY.

         The Company shall pay to the Trustee from time to time reasonable
compensation for its acceptance of this Indenture and services hereunder. The
Trustee's compensation shall not be limited by any law on compensation of a
trustee of an express trust. The Company shall reimburse the Trustee promptly
upon request for all reasonable disbursements, advances and expenses incurred or
made by it in addition to the compensation for its services. Such expenses shall
include the reasonable compensation, disbursements and expenses of the Trustee's
agents and counsel.

         The Company shall indemnify the Trustee against any and all losses,
liabilities or expenses incurred by it arising out of or in connection with the
acceptance or administration of its duties under this Indenture, including the
costs and expenses of enforcing this Indenture against the Company (including
this Section 7.07) and defending itself against any claim (whether asserted by
the Company or any Holder or any other person) or liability in connection with
the exercise or performance of any of its powers or duties hereunder, except to
the extent any such loss, liability or expense may be attributable to its
negligence or bad faith. The Trustee shall notify the Company promptly of any
claim for which it may seek indemnity. Failure by the Trustee to so notify the
Company shall not relieve the Company of its obligations hereunder. The Company
shall defend the claim and the Trustee shall cooperate in the defense. The
Trustee may have separate counsel and the Company shall pay the reasonable fees
and expenses of such counsel. The Company need not pay for any settlement made
without its consent, which consent shall not be unreasonably withheld.

         The obligations of the Company under this Section 7.07 shall survive
the satisfaction and discharge of this Indenture.

         To secure the Company's payment obligations in this Section, the
Trustee shall have a Lien prior to the Notes on all money or property held or
collected by the Trustee, except that held in trust to pay principal and
interest on particular Notes. Such Lien shall survive the satisfaction and
discharge of this Indenture.

         When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 6.01(g) or (h) hereof occurs, the expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute expenses of administration under any
Bankruptcy Law.

         The Trustee shall comply with the provisions of TIA ss. 313(b)(2) to
the extent applicable.

     SECTION 7.08.    REPLACEMENT OF TRUSTEE.

         A resignation or removal of the Trustee and appointment of a successor
Trustee shall become effective only upon the successor Trustee's acceptance of
appointment as provided in this Section.

         The Trustee may resign in writing at any time and be discharged from
the trust hereby created by so notifying the Company. The Holders of Notes of a
majority in principal

                                      -67-


amount of the then outstanding Notes may remove the Trustee by so notifying the
Trustee and the Company in writing. The Company may remove the Trustee if:

         (a) the Trustee fails to comply with Section 7.10 hereof;

         (b) the Trustee is adjudged a bankrupt or an insolvent or an order for
relief is entered with respect to the Trustee under any Bankruptcy Law;

         (c) a Custodian or public officer takes charge of the Trustee or its
property; or

         (d) the Trustee becomes incapable of acting.

         If the Trustee resigns or is removed or if a vacancy exists in the
office of Trustee for any reason, the Company shall promptly appoint a successor
Trustee. Within one year after the successor Trustee takes office, the Holders
of a majority in principal amount of the then outstanding Notes may appoint a
successor Trustee to replace the successor Trustee appointed by the Company.

         If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company, or
the Holders of Notes of at least 10% in principal amount of the then outstanding
Notes may petition any court of competent jurisdiction for the appointment of a
successor Trustee.

         If the Trustee, after written request by any Holder of a Note who has
been a Holder of a Note for at least six months, fails to comply with Section
7.10, such Holder of a Note may petition any court of competent jurisdiction for
the removal of the Trustee and the appointment of a successor Trustee.

         A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company. Thereupon, the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture. The successor Trustee shall mail a notice of its
succession to Holders of the Notes. The retiring Trustee shall promptly transfer
all property held by it as Trustee to the successor Trustee; provided all sums
owing to the Trustee hereunder have been paid and subject to the Lien provided
for in Section 7.07 hereof. Notwithstanding replacement of the Trustee pursuant
to this Section 7.08, the Company's obligations under Section 7.07 hereof shall
continue for the benefit of the retiring Trustee.

     SECTION 7.09.    SUCCESSOR TRUSTEE BY MERGER, ETC.

         If the Trustee consolidates, merges or converts into, or transfers all
or substantially all of its corporate trust business to, another corporation,
the successor corporation without any further act shall be the successor
Trustee.

                                      -68-


     SECTION 7.10.    ELIGIBILITY; DISQUALIFICATION.

         There shall at all times be a Trustee hereunder that is a corporation
organized and doing business under the laws of the United States of America or
of any state thereof that is authorized under such laws to exercise corporate
trustee power, that is subject to supervision or examination by federal or state
authorities and that has a combined capital and surplus of at least $50 million
as set forth in its most recent published annual report of condition.

         This Indenture shall always have a Trustee who satisfies the
requirements of TIA ss. 310(a)(1), (2) and (5). The Trustee is subject to TIA
ss. 310(b).

     SECTION 7.11.    PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

         The Trustee is subject to TIA ss. 311(a), excluding any creditor
relationship listed in TIA ss. 311(b). A Trustee who has resigned or been
removed shall be subject to TIA ss. 311(a) to the extent indicated therein.

                                   ARTICLE 8.
                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

     SECTION 8.01.    OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT DEFEASANCE.

         When (i) the Company delivers to the Trustee all outstanding Notes
(other than Notes replaced pursuant to Section 2.07) for cancellation or (ii)
all outstanding Notes have become due and payable, whether at maturity or as a
result of the mailing of a notice of redemption pursuant to Article 3 hereof and
the Company irrevocably deposits with the Trustee funds sufficient to pay at
maturity or upon redemption all outstanding Notes, including interest thereon to
maturity or such redemption date (other than Notes replaced pursuant to Section
2.07), and if in either case the Company pays all other sums payable hereunder
by the Company, then this Indenture shall, subject to the proviso set forth in
Section 8.02, cease to be of further effect. The Company may, at the option of
its Board of Directors evidenced by a resolution set forth in an Officers'
Certificate, at any time, elect to have either Section 8.02 or 8.03 hereof
applied to all outstanding Notes upon compliance with the conditions set forth
below in this Article Eight.

     SECTION 8.02.    LEGAL DEFEASANCE AND DISCHARGE.

         Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.02, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be deemed to have been
discharged from its obligations with respect to all outstanding Notes on the
date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance"). For this purpose, Legal Defeasance means that the Company shall be
deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under such Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same); PROVIDED

                                      -69-


that the following provisions which shall survive until otherwise terminated or
discharged hereunder: (a) the rights of Holders of outstanding Notes to receive
solely from the trust fund described in Section 8.04 hereof, and as more fully
set forth in such Section, payments in respect of the principal of, premium, if
any, and interest and liquidated damages on such Notes when such payments are
due, (b) the Company's obligations with respect to such Notes under Article 2
and Section 4.02 hereof, (c) the rights, powers, trusts, duties and immunities
of the Trustee hereunder and the Company's obligations in connection therewith
and (d) this Article Eight. Subject to compliance with this Article Eight, the
Company may exercise its option under this Section 8.02 notwithstanding the
prior exercise of its option under Section 8.03 hereof.

     SECTION 8.03.    COVENANT DEFEASANCE.

         Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be released from its
obligations under the covenants contained in Sections 4.07, 4.08, 4.09, 4.10,
4.11, 4.12, 4.13, 4.15, 4.16, 4.17 and 4.18 hereof with respect to the
outstanding Notes on and after the date the conditions set forth in Section 8.04
are satisfied (hereinafter, "Covenant Defeasance"), and the Notes shall
thereafter be deemed not "outstanding" for the purposes of any direction,
waiver, consent or declaration or act of Holders (and the consequences of any
thereof) in connection with such covenants, but shall continue to be deemed
"outstanding" for all other purposes hereunder (it being understood that such
Notes shall not be deemed outstanding for accounting purposes). For this
purpose, Covenant Defeasance means that, with respect to the outstanding Notes,
the Company may omit to comply with and shall have no liability in respect of
any term, condition or limitation set forth in any such covenant, whether
directly or indirectly, by reason of any reference elsewhere herein to any such
covenant or by reason of any reference in any such covenant to any other
provision herein or in any other document and such omission to comply shall not
constitute a Default or an Event of Default under Section 6.01 hereof, but,
except as specified above, the remainder of this Indenture and such Notes shall
be unaffected thereby. In addition, upon the Company's exercise under Section
8.01 hereof of the option applicable to this Section 8.03 hereof, subject to the
satisfaction of the conditions set forth in Section 8.04 hereof, Sections
6.01(d) through 6.01(f) hereof shall not constitute Events of Default.

     SECTION 8.04.    CONDITIONS TO LEGAL OR COVENANT DEFEASANCE.

         The following shall be the conditions to the application of either
Section 8.02 or 8.03 hereof to the outstanding Notes:

In order to exercise either Legal Defeasance or Covenant Defeasance:

                  (a) the Company must irrevocably deposit with the Trustee, in
         trust, for the benefit of the Holders, cash in United States dollars,
         non-callable Government Securities, or a combination thereof, in such
         amounts as will be sufficient, in the opinion of a nationally
         recognized firm of independent public accountants, to pay the principal
         of, premium, if any, and interest and liquidated damages on the
         outstanding Notes on the stated maturity or on the applicable
         redemption date, as the case may be, and the

                                      -70-


         Company must specify whether the Notes are being defeased to maturity
         or to a particular redemption date;

                  (b) in the case of an election under Section 8.02 hereof, the
         Company shall have delivered to the Trustee an Opinion of Counsel in
         the United States reasonably acceptable to the Trustee confirming that
         (A) the Company has received from, or there has been published by, the
         Internal Revenue Service a ruling or (B) since the date of this
         Indenture, there has been a change in the applicable federal income tax
         law, in either case to the effect that, and based thereon such Opinion
         of Counsel shall confirm that, the Holders of the outstanding Notes
         will not recognize income, gain or loss for federal income tax purposes
         as a result of such Legal Defeasance and will be subject to federal
         income tax on the same amounts, in the same manner and at the same
         times as would have been the case if such Legal Defeasance had not
         occurred;

                  (c) in the case of an election under Section 8.03 hereof, the
         Company shall have delivered to the Trustee an Opinion of Counsel in
         the United States reasonably acceptable to the Trustee confirming that
         the Holders of the outstanding Notes will not recognize income, gain or
         loss for federal income tax purposes as a result of such Covenant
         Defeasance and will be subject to federal income tax on the same
         amounts, in the same manner and at the same times as would have been
         the case if such Covenant Defeasance had not occurred;

                  (d) no Default or Event of Default shall have occurred and be
         continuing on the date of such deposit (other than a Default or Event
         of Default resulting from the incurrence of Indebtedness all or a
         portion of the proceeds of which will be used to defease the Notes
         pursuant to this Article Eight concurrently with such incurrence) or
         insofar as Sections 6.01(g) or 6.01(h) hereof is concerned, at any time
         in the period ending on the 91st day after the date of deposit;

                  (e) such Legal Defeasance or Covenant Defeasance shall not
         result in a breach or violation of, or constitute a default under, any
         material agreement or instrument (other than this Indenture) to which
         the Company or any of its Restricted Subsidiaries is a party or by
         which the Company or any of its Restricted Subsidiaries is bound;

                  (f) the Company shall have delivered to the Trustee an Opinion
         of Counsel (which may be subject to customary exceptions) to the effect
         that after the 91st day following the deposit, the trust funds will not
         be subject to the effect of any applicable bankruptcy, insolvency,
         reorganization or similar laws affecting creditors' rights generally;

                  (g) the Company shall have delivered to the Trustee an
         Officers' Certificate stating that the deposit was not made by the
         Company with the intent of preferring the Holders over any other
         creditors of the Company or with the intent of defeating, hindering,
         delaying or defrauding any creditors of the Company or others; and

                                      -71-


                  (h) the Company shall have delivered to the Trustee an
         Officers' Certificate and an Opinion of Counsel, each stating that all
         conditions precedent provided for or relating to the Legal Defeasance
         or the Covenant Defeasance have been complied with.

     SECTION 8.05.    DEPOSITED MONEY AND GOVERNMENT SECURITIES TO BE HELD IN
                      TRUST; OTHER MISCELLANEOUS PROVISIONS.

         Subject to Section 8.06 hereof, all money and non-callable Government
Securities (including the proceeds thereof) deposited with the Trustee (or other
qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of such Notes of all sums due and to
become due thereon in respect of principal, premium, if any, interest and
liquidated damages, if any, but such money need not be segregated from other
funds except to the extent required by law.

         The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the cash or non-callable Government
Securities deposited pursuant to Section 8.04 hereof or the principal and
interest received in respect thereof other than any such tax, fee or other
charge which by law is for the account of the Holders of the outstanding Notes.

         Anything in this Article Eight to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon the request
of the Company any money or non-callable Government Securities held by it as
provided in Section 8.04 hereof which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee (which may be the opinion delivered under
Section 8.04(a) hereof), are in excess of the amount thereof that would then be
required to be deposited to effect an equivalent Legal Defeasance or Covenant
Defeasance.

     SECTION 8.06.    REPAYMENT TO COMPANY.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of, premium, if any,
or interest on any Note and remaining unclaimed for two years after such
principal, and premium, if any, or interest has become due and payable shall be
paid to the Company on its request or (if then held by the Company) shall be
discharged from such trust; and the Holder of such Note shall thereafter, as a
secured creditor, look only to the Company for payment thereof, and all
liability of the Trustee or such Paying Agent with respect to such trust money,
and all liability of the Company as trustee thereof, shall thereupon cease.

     SECTION 8.07.    REINSTATEMENT.

         If the Trustee or Paying Agent is unable to apply any United States
dollars or non-callable Government Securities in accordance with Section 8.02 or
8.03 hereof, as the case may be, by reason of any order or judgment of any court
or governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this

                                      -72-


Indenture and the Notes shall be revived and reinstated as though no deposit had
occurred pursuant to Section 8.02 or 8.03 hereof until such time as the Trustee
or Paying Agent is permitted to apply all such money in accordance with Section
8.02 or 8.03 hereof, as the case may be; provided, however, that, if the Company
makes any payment of principal of, premium, if any, or interest on any Note
following the reinstatement of its obligations, the Company shall be subrogated
to the rights of the Holders of such Notes to receive such payment from the
money held by the Trustee or Paying Agent.

                                   ARTICLE 9.
                        AMENDMENT, SUPPLEMENT AND WAIVER

     SECTION 9.01.    WITHOUT CONSENT OF HOLDERS OF NOTES.

         Notwithstanding Section 9.02 of this Indenture, the Company and the
Trustee may amend or supplement this Indenture or the Notes without the consent
of any Holder of a Note:

                  (a) to cure any ambiguity, defect or inconsistency;

                  (b) to provide for uncertificated Notes in addition to or in
         place of certificated Notes or to alter the provisions of Article 2
         hereof (including the related definitions) in a manner that does not
         materially adversely affect any Holder;

                  (c) to provide for the assumption of the Company's obligations
         to the Holders of the Notes by a successor to the Company pursuant to
         Article 5 hereof;

                  (d) to make any change that would provide any additional
         rights or benefits to the Holders of the Notes or that does not
         adversely affect the legal rights hereunder of any Holder of the Note;

                  (e) to provide for the guarantee of the Notes by a Restricted
         Subsidiary in accordance with Section 4.18;

                  (f) to comply with requirements of the SEC in order to effect
         or maintain the qualification of this Indenture under the TIA.

         Upon the request of the Company accompanied by a resolution of its
Board of Directors authorizing the execution of any such amended or supplemental
Indenture, and upon receipt by the Trustee of the documents described in Section
7.02 hereof, the Trustee shall join with the Company in the execution of any
amended or supplemental Indenture authorized or permitted by the terms of this
Indenture and to make any further appropriate agreements and stipulations that
may be therein contained, but the Trustee shall not be obligated to enter into
such amended or supplemental Indenture that affects its own rights, duties or
immunities under this Indenture or otherwise.

                                      -73-


     SECTION 9.02.    WITH CONSENT OF HOLDERS OF NOTES.

         Except as provided below in this Section 9.02, the Company and the
Trustee may amend or supplement this Indenture (including Section 3.09, 4.10 and
4.15 hereto) and the Notes may be amended or supplemented with the consent of
the Holders of at least 51% of the aggregate principal amount of the Notes then
outstanding voting as a single class (including consents obtained in connection
with a tender offer or exchange offer for, or purchase of, the Notes), and,
subject to Sections 6.04 and 6.07 hereof, any existing Default or Event of
Default (other than a Default or Event of Default in the payment of the
principal of, premium, if any, or interest on the Notes, except a payment
default resulting from an acceleration that has been rescinded) or compliance
with any provision of this Indenture or the Notes may be waived with the consent
of the Holders of at least 51% of the aggregate principal amount of the then
outstanding Notes voting as a single class (including consents obtained in
connection with a tender offer or exchange offer for, or purchase of, the
Notes). Section 2.08 hereof shall determine which Notes are considered to be
"outstanding" for purposes of this Section 9.02.

         Upon the request of the Company accompanied by a resolution of its
Board of Directors authorizing the execution of any such amended or supplemental
Indenture, and upon the filing with the Trustee of evidence satisfactory to the
Trustee of the consent of the Holders of Notes as aforesaid, and upon receipt by
the Trustee of the documents described in Section 7.02 hereof, the Trustee shall
join with the Company in the execution of such amended or supplemental Indenture
unless such amended or supplemental Indenture directly affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise, in which case
the Trustee may in its discretion, but shall not be obligated to, enter into
such amended or supplemental Indenture.

         It shall not be necessary for the consent of the Holders of Notes under
this Section 9.02 to approve the particular form of any proposed amendment or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

         After an amendment, supplement or waiver under this Section becomes
effective, the Company shall mail to the Holders of Notes affected thereby a
notice briefly describing the amendment, supplement or waiver. Any failure of
the Company to mail such notice, or any defect therein, shall not, however, in
any way impair or affect the validity of any such amended or supplemental
Indenture or waiver. Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate principal amount of the Notes then outstanding voting as a
single class may waive compliance in a particular instance by the Company with
any provision of this Indenture or the Notes. However, without the consent of
each Holder affected, an amendment or waiver under this Section 9.02 may not
(with respect to any Notes held by a non- consenting Holder):

                  (a) reduce the principal amount of Notes whose Holders must
         consent to an amendment, supplement or waiver;

                  (b) reduce the principal of or change the fixed maturity of
         any Note or alter or waive any of the provisions with respect to the
         redemption of the Notes except as provided above with respect to
         Sections 3.09, 4.10 and 4.15 hereof;

                                      -74-


                  (c) reduce the rate of or change the time for payment of
         interest, including default interest, on any Note;

                  (d) waive a Default or Event of Default in the payment of
         principal of or premium, if any, or interest on the Notes (except a
         rescission of acceleration of the Notes by the Holders of at least a
         majority in aggregate principal amount of the then outstanding Notes
         and a waiver of the payment default that resulted from such
         acceleration);

                  (e) make any Note payable in money other than that stated in
         the Notes;

                  (f) make any change in the provisions of this Indenture
         relating to waivers of past Defaults or the rights of Holders of Notes
         to receive payments of principal of, premium, if any, or interest on
         the Notes;

                  (g) waive a redemption payment with respect to any Note
         (except a payment required by Section 3.09, 4.10 or 4.15 hereof);

                  (h) provide for contractual subordination of the notes;

                  (i) except as provided in Article 8 or in accordance with the
         terms of any Subsidiary Guarantee, release a Subsidiary Guarantor from
         its obligations under its Subsidiary Guarantee or make any change in a
         Subsidiary Guarantee that would adversely affect the Holders of the
         Notes; or

                  (j) make any change in Section 6.04 or 6.07 hereof or in the
         foregoing amendment and waiver provisions.

     SECTION 9.03.    COMPLIANCE WITH TRUST INDENTURE ACT.

         Every amendment or supplement to this Indenture or the Notes shall be
set forth in an amended or supplemental Indenture that complies with the TIA as
then in effect.

     SECTION 9.04.    REVOCATION AND EFFECT OF CONSENTS.

         Until an amendment, supplement or waiver becomes effective, a consent
to it by a Holder of a Note is a continuing consent by the Holder of a Note and
every subsequent Holder of a Note or portion of a Note that evidences the same
debt as the consenting Holder's Note, even if notation of the consent is not
made on any Note. However, any such Holder of a Note or subsequent Holder of a
Note may revoke the consent as to its Note if the Trustee receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective. An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

     SECTION 9.05.    NOTATION ON OR EXCHANGE OF NOTES.

         The Trustee may place an appropriate notation about an amendment,
supplement or waiver on any Note thereafter authenticated. The Company in
exchange for all Notes may

                                      -75-


issue and the Trustee shall, upon receipt of an Authentication Order,
authenticate new Notes that reflect the amendment, supplement or waiver.

         Failure to make the appropriate notation or issue a new Note shall not
affect the validity and effect of such amendment, supplement or waiver.

     SECTION 9.06.    TRUSTEE TO SIGN AMENDMENTS, ETC.

         The Trustee shall sign any amended or supplemental Indenture authorized
pursuant to this Article Nine if the amendment or supplement does not adversely
affect the rights, duties, liabilities or immunities of the Trustee. The Company
may not sign an amendment or supplemental Indenture until the Board of Directors
approves it. In executing any amended or supplemental indenture, the Trustee
shall be entitled to receive and (subject to Section 7.01 hereof) shall be fully
protected in relying upon, in addition to the documents required by Section
10.04 hereof, an Officer's Certificate and an Opinion of Counsel stating that
the execution of such amended or supplemental indenture is authorized or
permitted by this Indenture.

                                  ARTICLE 10.
                                  MISCELLANEOUS

     SECTION 10.01.   TRUST INDENTURE ACT CONTROLS.

         If any provision of this Indenture limits, qualifies or conflicts with
the duties imposed by TIA ss. 318(c), the imposed duties shall control.

     SECTION 10.02.   NOTICES.

         Any notice or communication by the Company or the Trustee to the others
is duly given if in writing and delivered in Person or mailed by first class
mail (registered or certified, return receipt requested), telex, telecopier or
overnight air courier guaranteeing next day delivery, to the others' address.

         If to the Company:

         SBA Communications Corporation
         One Town Center Road
         Boca Raton, FL  33486
         Telephone No.:  (561) 995-7670
         Telecopier No.:  (561) 995-7626
         Attention:  General Counsel

         With a copy to:

         Robert C. Boehm
         Akerman, Senterfitt & Eidson, P.A.
         Sun Trust International Center

                                      -76-


         28th Floor
         One S.E. 3rd Avenue
         Miami, FL  33131-1714
         Telephone No.:  (305) 982-5579
         Telecopier No.:  (305) 374-5095


         If to the Trustee:

         State Street Bank and Trust Company
         2 Avenue de Lafayette
         Boston, MA 02111
         Telecopier No.:  (617) 662-1462
         Attention:  Corporate Trust Department

         The Company or the Trustee, by notice to the others may designate
additional or different addresses for subsequent notices or communications.

         All notices and communications (other than those sent to Holders) shall
be deemed to have been duly given: at the time delivered by hand, if personally
delivered; five Business Days after being deposited in the mail, postage
prepaid, if mailed; when answered back, if telexed; when receipt acknowledged,
if telecopied; and the next Business Day after timely delivery to the courier,
if sent by overnight air courier guaranteeing next day delivery.

         Any notice or communication to a Holder shall be mailed by first class
mail, certified or registered, return receipt requested, or by overnight air
courier guaranteeing next day delivery to its address shown on the register kept
by the Registrar. Any notice or communication shall also be so mailed to any
Person described in TIA ss. 313(c), to the extent required by the TIA. Failure
to mail a notice or communication to a Holder or any defect in it shall not
affect its sufficiency with respect to other Holders.

         If a notice or communication is mailed in the manner provided above
within the time prescribed, it is duly given, whether or not the addressee
receives it.

         If the Company mails a notice or communication to Holders, it shall
mail a copy to the Trustee and each Agent at the same time.

     SECTION 10.03.   COMMUNICATION BY HOLDERS OF NOTES WITH OTHER HOLDERS OF
                      NOTES.

         Holders may communicate pursuant to TIA ss. 312(b) with other Holders
with respect to their rights under this Indenture or the Notes. The Company, the
Trustee, the Registrar and anyone else shall have the protection of TIA ss.
312(c).

     SECTION 10.04.   CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT.

         Upon any request or application by the Company to the Trustee to take
any action under this Indenture, the Company shall furnish to the Trustee:

                                      -77-


                  (a) an Officers' Certificate in form and substance reasonably
         satisfactory to the Trustee (which shall include the statements set
         forth in Section 10.05 hereof) stating that, in the opinion of the
         signers, all conditions precedent and covenants, if any, provided for
         in this Indenture relating to the proposed action have been satisfied;
         and

                  (b) an Opinion of Counsel in form and substance reasonably
         satisfactory to the Trustee (which shall include the statements set
         forth in Section 10.05 hereof) stating that, in the opinion of such
         counsel, all such conditions precedent and covenants have been
         satisfied.

     SECTION 10.05.   STATEMENTS REQUIRED IN CERTIFICATE OR OPINION.

         Each certificate or opinion with respect to compliance with a condition
or covenant provided for in this Indenture (other than a certificate provided
pursuant to TIA ss. 314(a)(4)) shall comply with the provisions of TIA ss.
314(e) and shall include:

                  (a) a statement that the Person(s) making such certificate or
         opinion has read such covenant or condition;

                  (b) a brief statement as to the nature and scope of the
         examination or investigation upon which the statements or opinions
         contained in such certificate or opinion are based;

                  (c) a statement that, in the opinion of such Person, he or she
         has or they have made such examination or investigation as is necessary
         to enable such Person or Persons to express an informed opinion as to
         whether or not such covenant or condition has been satisfied; and

                  (d) a statement as to whether or not, in the opinion of such
         Persons, such condition or covenant has been satisfied.

     SECTION 10.06.   RULES BY TRUSTEE AND AGENTS.

         The Trustee may make reasonable rules for action by or at a meeting of
Holders. The Registrar or Paying Agent may make reasonable rules and set
reasonable requirements for its functions.

     SECTION 10.07.   NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES
                      AND STOCKHOLDERS.

         No past, present or future director, officer, employee, incorporator or
stockholder of the Company, as such, shall have any liability for any
obligations of the Company under the Notes, this Indenture or for any claim
based on, in respect of, or by reason of, such obligations or their creation.
Each Holder by accepting a Note waives and releases all such liability. The
waiver and release are part of the consideration for issuance of the Notes.

                                      -78-


     SECTION 10.08.   GOVERNING LAW.

         THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO
CONSTRUE THIS INDENTURE, THE NOTES WITHOUT GIVING EFFECT TO APPLICABLE
PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF
ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

     SECTION 10.09.   NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS.

         This Indenture may not be used to interpret any other indenture, loan
or debt agreement of the Company or its Subsidiaries or of any other Person. Any
such indenture, loan or debt agreement may not be used to interpret this
Indenture.

     SECTION 10.10.   SUCCESSORS.

         All agreements of the Company in this Indenture and the Notes shall
bind its successors. All agreements of the Trustee in this Indenture shall bind
its successors.

     SECTION 10.11.   SEVERABILITY.

         In case any provision in this Indenture or in the Notes shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

     SECTION 10.12.   COUNTERPART ORIGINALS.

         The parties may sign any number of copies of this Indenture. Each
signed copy shall be an original, but all of them together represent the same
agreement.

     SECTION 10.13.   TABLE OF CONTENTS, HEADINGS, ETC.

         The Table of Contents, Cross-Reference Table and Headings of the
Articles and Sections of this Indenture have been inserted for convenience of
reference only, are not to be considered a part of this Indenture and shall in
no way modify or restrict any of the terms or provisions hereof.

                         [Signatures on following page]

                                      -79-


                                       SIGNATURES

                                          Dated as of February 2, 2001

                                          SBA COMMUNICATIONS CORPORATION

                                          By:  /s/ Jeffrey A. Stoops
                                             ----------------------------------
                                             Name:  Jeffrey A. Stoops
                                             Title: President



                                          STATE STREET BANK AND TRUST
                                          COMPANY, as Trustee


                                          By:  /s/ Gerald R. Wheeler
                                             ----------------------------------
                                             Name:  Gerald R. Wheeler
                                             Title:  Vice President

                                      -80-


                          10 1/4% Senior Notes due 2009

No. 1                                              Principal Amount $499,295,000

                         SBA COMMUNICATIONS CORPORATION

promises to pay to CEDE & CO., or registered assigns, the principal sum of four
hundred ninety-nine million, two hundred ninety-five thousand dollars
($499,295,000)on February 1, 2009. Interest Payment Dates: February 1 and August
1, commencing August 1, 2001

Record Dates:  January 15 and July 15

                                       Dated:  February     , 2001

                                       SBA COMMUNICATIONS CORPORATION

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:


This is one of the Global Notes referred
to in the within-mentioned Indenture:

STATE STREET BANK AND TRUST COMPANY,
as Trustee

By:
   ------------------------------------
   Authorized Signatory

                                      A1-1


                          10 1/4% Senior Notes due 2009

THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO
A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.

THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE SECURITY
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH
PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER
MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF THE
SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER. THE HOLDER OF THE SECURITY
EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT (A) SUCH SECURITY
MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1)(a) TO A PERSON WHO THE
SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN
RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF
RULE 144A, (b) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144 UNDER THE
SECURITIES ACT, (c) OUTSIDE THE UNITED STATES TO A FOREIGN PERSON IN A
TRANSACTION MEETING THE REQUIREMENTS OF RULE 903 OR 904 UNDER THE SECURITIES ACT
OR (d) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS
OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF THE COMPANY SO
REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS
OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B)
THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER
FROM IT OF THE SECURITY EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN
(A) ABOVE.

         Capitalized terms used herein shall have the meanings assigned to them
in the Indenture referred to below unless otherwise indicated.

         1.  INTEREST. SBA Communications Corporation, a Florida corporation
(the "Company"), promises to pay interest on the principal amount of this Note
at 10 1/4% per annum from February 2, 2001 until maturity. The Company will pay
interest semi-annually in arrears on

                                      A1-2


February 1 and August 1 of each year, or if any such day is not a Business Day,
on the next succeeding Business Day (each an "Interest Payment Date"); PROVIDED
that the first such interest payment date shall be August 1, 2001. Interest on
the Notes will accrue from the most recent date on which interest has been paid
or, if no interest has been paid, from February 2, 2001. The Company shall pay
interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue principal and premium, if any, from time to time on
demand at a rate that is 1% per annum in excess of the rate then in effect; it
shall pay interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue installments of interest (without regard to any
applicable grace periods) from time to time on demand at the same rate to the
extent lawful. Interest will be computed on the basis of a 360-day year of
twelve 30-day months.

         2.  METHOD OF PAYMENT. The Company will pay interest on the Notes
(except defaulted interest) to the Persons who are registered Holders of Notes
at the close of business on the January 15 or July 15 next preceding the
Interest Payment Date (each, a "Record Date"), even if such Notes are canceled
after such record date and on or before such Interest Payment Date, except as
provided in Section 2.12 of the Indenture with respect to defaulted interest.
The Notes will be payable as to principal, premium, if any, and interest at the
office or agency of the Company maintained for such purpose within or without
the City and State of New York, or, at the option of the Company, payment of
interest may be made by check mailed to the Holders at their addresses set forth
in the register of Holders, and provided that payment by wire transfer of
immediately available funds will be required with respect to principal of and
interest and premium on, all Global Notes and all other Notes the Holders of
which shall have provided wire transfer instructions to the Company or the
Paying Agent prior to the Record Date. Such payment shall be in such coin or
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts.

         3.  PAYING AGENT AND REGISTRAR. Initially, State Street Bank and Trust
Company, the Trustee under the Indenture, will act as Paying Agent and
Registrar. The Company may change any Paying Agent or Registrar without notice
to any Holder. The Company or any of its Subsidiaries may act in any such
capacity.

         4.  INDENTURE. The Company issued the Notes under an Indenture dated as
of February 2, 2001 ("Indenture") between the Company and the Trustee. The terms
of the Notes include those stated in the Indenture and those made part of the
Indenture by reference to the Trust Indenture Act of 1939, as amended (15 U.S.
Code ss.ss. 77aaa-77bbbb). The Notes are subject to all such terms, and Holders
are referred to the Indenture and such Act for a statement of such terms. To the
extent any provision of this Note conflicts with the express provisions of the
Indenture, the provisions of the Indenture shall govern and be controlling. The
Notes are obligations of the Company limited to $500 million in maximum
aggregate principal amount.

         5.  OPTIONAL REDEMPTION.

         (A) EXCEPT AS SET FORTH IN SUBPARAGRAPH (B) OF THIS PARAGRAPH 5, THE
NOTES SHALL NOT BE REDEEMABLE AT THE COMPANY'S OPTION PRIOR TO FEBRUARY 1, 2005.
THEREAFTER, THE NOTES WILL BE SUBJECT TO REDEMPTION AT ANY TIME AT THE OPTION OF
THE COMPANY, IN WHOLE OR

                                      A1-3


IN PART, UPON NOT LESS THAN 30 NOR MORE THAN 60 DAYS' NOTICE AT THE REDEMPTION
PRICES (EXPRESSED AS PERCENTAGES OF PRINCIPAL AMOUNT) SET FORTH BELOW PLUS
ACCRUED AND UNPAID INTEREST, IF ANY, TO THE APPLICABLE REDEMPTION DATE (SUBJECT
TO THE RIGHT OF HOLDERS OF RECORD ON THE RELEVANT RECORD DATE TO RECEIVE
INTEREST AND LIQUIDATED DAMAGES DUE ON THE RELEVANT INTEREST PAYMENT DATE), IF
REDEEMED DURING THE TWELVE-MONTH PERIOD BEGINNING ON FEBRUARY 1 OF THE YEARS
INDICATED BELOW:

         Year                                               Percentage
         ----                                               ----------

         2005............................................    105.125%
         2006............................................    103.417%
         2007............................................    101.708%
         2008 and thereafter.............................    100.000%

         (B) NOTWITHSTANDING THE PROVISIONS OF SUBPARAGRAPH (A) OF THIS
PARAGRAPH 5, ON OR PRIOR TO FEBRUARY 1, 2004, THE COMPANY MAY ON ANY ONE OR MORE
OCCASIONS REDEEM UP TO 35% OF THE AGGREGATE PRINCIPAL AMOUNT OF NOTES ISSUED
UNDER THE INDENTURE AT A REDEMPTION PRICE EQUAL TO 110.250% OF THE PRINCIPAL
AMOUNT THEREOF ON THE REDEMPTION DATE WITH THE NET CASH PROCEEDS OF ONE OR MORE
PUBLIC EQUITY OFFERINGS AND/OR STRATEGIC EQUITY INVESTMENTS; PROVIDED THAT AT
LEAST 65% OF THE AGGREGATE PRINCIPAL AMOUNT OF NOTES ISSUED UNDER THE INDENTURE
REMAINS OUTSTANDING IMMEDIATELY AFTER THE OCCURRENCE OF SUCH REDEMPTION
(EXCLUDING NOTES HELD BY THE COMPANY OR ANY OF ITS SUBSIDIARIES);AND PROVIDED,
FURTHER, THAT SUCH REDEMPTION SHALL OCCUR WITHIN 60 DAYS OF THE DATE OF THE
CLOSING OF SUCH PUBLIC EQUITY OFFERING AND/OR STRATEGIC EQUITY INVESTMENT.

         6.  MANDATORY REDEMPTION. Except as set forth in paragraph 7 below, the
Company shall not be required to make mandatory redemption payments with respect
to the Notes.

         7.  REPURCHASE AT OPTION OF HOLDER.

         (a) Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to repurchase all or any part (equal
to $1,000 or an integral multiple thereof) of such Holder's Notes pursuant to
the offer described below (the "Change of Control Offer") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest to the date of purchase (the "Change of Control Payment").
Within 30 days following any Change of Control, the Company shall mail a notice
to each Holder setting forth the procedures governing the Change of Control
Offer as required by the Indenture.

                                      A1-4


         (b) If the Company or a Restricted Subsidiary consummates any Asset
Sales, within five days of each date on which the aggregate amount of Excess
Proceeds exceeds $10 million, the Company shall commence an offer to all Holders
of Notes (an "Asset Sale Offer") pursuant to Section 3.09 of the Indenture to
purchase, on a pro rata basis, the maximum principal amount (or accreted value,
as applicable) of Notes and such other senior Indebtedness of the Company that
may be purchased out of the Excess Proceeds, at an offer price in cash in an
amount equal to 100% of the principal amount (or accreted value, as applicable)
thereof plus accrued and unpaid interest to the date of purchase (subject to the
right of Holders of record on the relevant record date to receive interest due
on the relevant Interest Payment Date), in accordance with the procedures set
forth in the Indenture and such other senior Indebtedness of the Company. To the
extent that any Excess Proceeds remain after consummation of an Asset Sale
Offer, the Company may use such Excess Proceeds for any purpose not otherwise
prohibited by the Indenture. If the aggregate principal amount of Notes and such
other senior Indebtedness of the Company tendered into such Asset Sale Offer
surrendered by Holders thereof exceeds the amount of Excess Proceeds, the
Trustee shall select the Notes and such other senior Indebtedness to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset to zero. Holders of Notes that are the
subject of an offer to purchase will receive an Asset Sale Offer from the
Company prior to any related purchase date and may elect to have such Notes
purchased by completing the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes.

         8.  NOTICE OF REDEMPTION. Notice of redemption will be mailed at least
30 days but not more than 60 days before the redemption date to each Holder
whose Notes are to be redeemed at its registered address. Notes in denominations
larger than $1,000 may be redeemed in part but only in whole multiples of
$1,000, unless all of the Notes held by a Holder are to be redeemed. On and
after the redemption date interest ceases to accrue on Notes or portions thereof
called for redemption.

         9.  DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form
without coupons in denominations of $1,000 and integral multiples of $1,000. The
transfer of Notes may be registered and Notes may be exchanged as provided in
the Indenture. The Registrar and the Trustee may require a Holder, among other
things, to furnish appropriate endorsements and transfer documents and the
Company may require a Holder to pay any taxes and fees required by law or
permitted by the Indenture. The Registrar need not exchange or register the
transfer of any Note or portion of a Note selected for redemption, except for
the unredeemed portion of any Note being redeemed in part. Also, the Registrar
need not exchange or register the transfer of any Notes for a period of 15 days
before a selection of Notes to be redeemed or during the period between a record
date and the corresponding Interest Payment Date.

         10. PERSONS DEEMED OWNERS. The registered Holder of a Note may be
treated as its owner for all purposes.

         11. AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions,
the Indenture or the Notes may be amended or supplemented with the consent of
the Holders of at least 51% in aggregate principal amount of the then
outstanding Notes voting as a single class, and any existing default or
compliance with any provision of the Indenture or the Notes (other

                                      A1-5


than a default in the payment of the principal of, premium, if any, or interest
on the Notes) may be waived with the consent of the Holders of at least 51% of
the aggregate principal amount of the then outstanding Notes voting as a single
class. Without the consent of any Holder of a Note, the Indenture or the Notes
may be amended or supplemented to cure any ambiguity, defect or inconsistency,
to provide for uncertificated Notes in addition to or in place of certificated
Notes, to provide for the assumption of the Company's obligations to Holders of
the Notes in case of a merger or consolidation, to make any change that would
provide any additional rights or benefits to the Holders of the Notes or that
does not adversely affect the legal rights under the Indenture of any such
Holder, to comply with the requirements of the Commission in order to effect or
maintain the qualification of the Indenture under the Trust Indenture Act.

         12. DEFAULTS AND REMEDIES. Events of Default include: (i) default for
30 days in the payment when due of interest on the Notes; (ii) default in
payment when due of principal of or premium, if any, on the Notes when the same
becomes due and payable at maturity, upon redemption (including in connection
with an offer to purchase) or otherwise, (iii) failure by the Company to comply
with Section 4.10, 4.15 or 5.01 of the Indenture; (iv) failure by the Company
for 30 days after notice to the Company by the Trustee or the Holders of at
least 25% in principal amount of the Notes then outstanding voting as a single
class to comply with certain other agreements in the Indenture or the Notes; (v)
default under certain other agreements relating to Indebtedness of the Company
which default (a) is caused by a failure to pay principal of or premium, if any,
or interest on such Indebtedness prior to the expiration of the grace period
provided in such Indebtedness on the date of such default ("Payment Default") or
(b) results in the acceleration of such Indebtedness prior to its express
maturity and, in each case, the principal amount of any such Indebtedness,
together with the principal amount of all other Indebtedness under which there
has been a Payment Default aggregates to $10.0 million or more; (vi) certain
final judgments for the payment of money aggregating in excess of $10.0 million
that remain undischarged for a period of 60 days; and (vii) certain events of
bankruptcy or insolvency with respect to the Company or any of its Restricted
Subsidiaries that is a Significant Subsidiary. If any Event of Default occurs
and is continuing, the Trustee or the Holders of at least 25% in principal
amount of the then outstanding Notes may declare all the Notes to be due and
payable. Notwithstanding the foregoing, in the case of an Event of Default
arising from certain events of bankruptcy or insolvency, all outstanding Notes
will become due and payable without further action or notice. Holders may not
enforce the Indenture or the Notes except as provided in the Indenture. Subject
to certain limitations, Holders of a majority in principal amount of the then
outstanding Notes may direct the Trustee in its exercise of any trust or power.
The Trustee may withhold from Holders of the Notes notice of any continuing
Default or Event of Default (except a Default or Event of Default relating to
the payment of principal or interest) if it determines that withholding notice
is in their interest. The Holders of a majority in aggregate principal amount of
the Notes then outstanding by notice to the Trustee may on behalf of the Holders
of all of the Notes waive any existing Default or Event of Default and its
consequences under the Indenture except a continuing Default or Event of Default
in the payment of interest on, or the principal of, the Notes. The Company is
required to deliver to the Trustee annually a statement regarding compliance
with the Indenture, and the Company is required upon becoming aware of any
Default or Event of Default, to deliver to the Trustee a statement specifying
such Default or Event of Default.

                                      A1-6


         13. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its individual or
any other capacity, may make loans to, accept deposits from, and perform
services for the Company or its Affiliates, and may otherwise deal with the
Company or its Affiliates, as if it were not the Trustee.

         14. NO RECOURSE AGAINST OTHERS. A director, officer, employee,
incorporator or stockholder, of the Company, as such, shall not have any
liability for any obligations of the Company under the Notes or the Indenture or
for any claim based on, in respect of, or by reason of, such obligations or
their creation. Each Holder by accepting a Note waives and releases all such
liability. The waiver and release are part of the consideration for the issuance
of the Notes.

         15. AUTHENTICATION. This Note shall not be valid until authenticated by
the manual signature of the Trustee or an authenticating agent.

         16. ABBREVIATIONS. Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

         17. ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES AND
RESTRICTED DEFINITIVE NOTES. In addition to the rights provided to Holders of
Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the Registration Rights
Agreement dated as of February 2, 2001, between the Company and the parties
named on the signature pages thereof (the "Registration Rights Agreement").

         18. CUSIP NUMBERS. Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders. No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

         The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

                  SBA Communications Corporation
                  One Town Center Road
                  Boca Raton, FL  33486
                  Attention:  General Counsel

                                      A1-7


                                 ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to

- ------------------------------------------------------------------------------
(Insert assignee's soc. or tax I.D. no.)

- ------------------------------------------------------------------------------

- ------------------------------------------------------------------------------

- ------------------------------------------------------------------------------

- ------------------------------------------------------------------------------
(Print or type assignee's name, address and zip code)

and irrevocably appoint_______________________________________________________
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.

- ------------------------------------------------------------------------------

Date: ______________

                                       Your Signature: _______________________
                                       (Sign exactly as your name appears on the
                                       face of this Note)


Signature Guarantee.

(Participant in a Recognized Signature
Guarantee Medallion Program)

                                      A1-8


                       OPTION OF HOLDER TO ELECT PURCHASE

         If you want to elect to have this Note purchased by the Company
pursuant to Section 4.10 or 4.15 of the Indenture, check the box below:

         [_] Section 4.10                          [_] Section 4.15

         If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased:

$________

Date: ________________

                                       Your Signature: _________________________
                                       (Sign exactly as your name appears on the
                                       face of this Note)


Signature Guarantee.

(Participant in a Recognized Signature
Guarantee Medallion Program)

                                      A1-9


            SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE/1/

         The following exchanges of a part of this Global Note for an interest
in another Global Note or for a Definitive Note, or exchanges of a part of
another Global Note or Definitive Note for an interest in this Global Note, have
been made:



                                                                       Principal Amount
                            Amount of                                 of this Global Note       Signature of
                           decrease in         Amount of increase       following such       authorized officer
                        Principal Amount      in Principal Amount        decrease (or           of Trustee or
Date of Exchange       of this Global Note    of this Global Note          increase)           Note Custodian
- ----------------       -------------------    -------------------          ---------           --------------
                                                                                    







- ---------------------------------------------
/1/  Insert this table only in a Global Note.

                                     A1-10


                          10 1/4% Senior Notes due 2009

No.  1                                                 Principal Amount $705,000

                         SBA COMMUNICATIONS CORPORATION

promises to pay to CEDE & CO., or registered assigns, the principal sum of seven
hundred five thousand dollars ($705,000) on February 1, 2009. Interest Payment
Dates: February 1 and August 1, Commencing August 1, 2001

Record Dates: January 15 and July 15

                                       Dated:  February     , 2001


                                       SBA COMMUNICATIONS CORPORATION



                                       By:  ___________________________________
                                            Name:
                                            Title:



This is one of the Global Notes referred
to in the within-mentioned Indenture:

STATE STREET BANK AND TRUST COMPANY,
as Trustee



By: ___________________________
    Authorized Signatory

                                      A2-1


                                 [Back of Note]
                          10 1/4% Senior Notes due 2009

THE RIGHTS ATTACHING TO THIS REGULATION S TEMPORARY GLOBAL NOTE, AND THE
CONDITIONS AND PROCEDURES GOVERNING ITS EXCHANGE FOR CERTIFICATED NOTES, ARE AS
SPECIFIED IN THE INDENTURE (AS DEFINED HEREIN). NEITHER THE HOLDER NOR THE
BENEFICIAL OWNERS OF THIS REGULATION S TEMPORARY GLOBAL NOTE SHALL BE ENTITLED
TO RECEIVE PAYMENT OF INTEREST HEREON.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A
NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR
ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY. UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY (55 WATER STREET, NEW YORK, NEW YORK) ("DTC"), TO THE COMPANY OR ITS
AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS MAY BE
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED
REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER
HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE NOTE (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE NOTE
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH
PURCHASER OF THE NOTE EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER MAY BE
RELYING ON THE EXEMPTION PROVIDED BY RULE 144A UNDER THE SECURITIES ACT. THE
HOLDER OF THE NOTE EVIDENCED HEREBY AGREES FOR THE BENEFIT OF THE COMPANY THAT
(A) SUCH NOTE MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1) (a) TO A
PERSON WHO THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER (AS
DEFINED IN OF RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION MEETING THE
REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE
144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED STATES TO A FOREIGN PERSON
IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 903 OR 904 UNDER THE
SECURITIES ACT OR (d) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF THE
COMPANY SO REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN EFFECTIVE
REGISTRATION

                                      A2-2


STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH THE APPLICABLE SECURITIES LAWS
OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND (B)
THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY ANY PURCHASER
OF THE NOTE EVIDENCED HEREBY OF THE RESALE RESTRICTIONS SET FORTH IN (A) ABOVE.

     Capitalized terms used herein shall have the meanings assigned to them in
the Indenture referred to below unless otherwise indicated.

         1.  INTEREST. SBA Communications Corporation, a Florida corporation
(the "Company"), promises to pay interest on the principal amount of this Note
at 10 1/4% per annum from February 1, 2001 until maturity. The Company will pay
interest semi-annually in arrears on February 1 and August 1 of each year, or if
any such day is not a Business Day, on the next succeeding Business Day (each an
"Interest Payment Date"); PROVIDED that the first such interest payment date
shall be August 1, 2001. Interest on the Notes will accrue from the most recent
date to which interest has been paid or, if no interest has been paid, from
February 2, 2001. The Company shall pay interest (including post-petition
interest in any proceeding under any Bankruptcy Law) on overdue principal and
premium, if any, from time to time on demand at a rate that is 1% per annum in
excess of the rate then in effect; it shall pay interest (including post-
petition interest in any proceeding under any Bankruptcy Law) on overdue
installments of interest (without regard to any applicable grace periods) from
time to time on demand at the same rate to the extent lawful. Interest will be
computed on the basis of a 360-day year of twelve 30-day months.

     Until this Regulation S Temporary Global Note is exchanged for one or more
Regulation S Permanent Global Notes, the Holder hereof shall not be entitled to
receive payments of interest hereon; until so exchanged in full, this Regulation
S Temporary Global Note shall in all other respects be entitled to the same
benefits as other Senior Discount Notes under the Indenture.

         2.  METHOD OF PAYMENT. The Company will pay interest on the Notes
(except defaulted interest) to the Persons who are registered Holders of Notes
at the close of business on the January 15 or July 15 next preceding the
Interest Payment Date (each, a "Record Date"), even if such Notes are canceled
after such record date and on or before such Interest Payment Date, except as
provided in Section 2.12 of the Indenture with respect to defaulted interest.
The Notes will be payable as to principal, premium, if any, and interest at the
office or agency of the Company maintained for such purpose within or without
the City and State of New York, or, at the option of the Company, payment of
interest may be made by check mailed to the Holders at their addresses set forth
in the register of Holders, and PROVIDED that payment by wire transfer of
immediately available funds will be required with respect to principal of and
interest and premium, all Global Notes and all other Notes the Holders of which
shall have provided wire transfer instructions to the Company or the Paying
Agent prior to the Record Date. Such payment shall be in such coin or currency
of the United States of America as at the time of payment is legal tender for
payment of public and private debts.

         3.  PAYING AGENT AND REGISTRAR. Initially, State Street Bank and Trust
Company, the Trustee under the Indenture, will act as Paying Agent and
Registrar. The

                                      A2-3


Company may change any Paying Agent or Registrar without notice to any Holder.
The Company or any of its Subsidiaries may act in any such capacity.

         4.  INDENTURE. The Company issued the Notes under an Indenture dated as
of February 2, 2001 ("Indenture") between the Company and the Trustee. The terms
of the Notes include those stated in the Indenture and those made part of the
Indenture by reference to the Trust Indenture Act of 1939, as amended (15 U.S.
Code ss.ss. 77aaa-77bbbb). The Notes are subject to all such terms, and Holders
are referred to the Indenture and such Act for a statement of such terms. The
Notes are obligations of the Company limited to $500 million in maximum
aggregate principal amount.

         5.  OPTIONAL REDEMPTION.

         (A) EXCEPT AS SET FORTH IN SUBPARAGRAPH (B) OF THIS PARAGRAPH 5, THE
NOTES SHALL NOT BE REDEEMABLE AT THE COMPANY'S OPTION PRIOR TO FEBRUARY 1, 2005.
THEREAFTER, THE NOTES WILL BE SUBJECT TO REDEMPTION AT ANY TIME AT THE OPTION OF
THE COMPANY, IN WHOLE OR IN PART, UPON NOT LESS THAN 30 NOR MORE THAN 60 DAYS'
NOTICE AT THE REDEMPTION PRICES (EXPRESSED AS PERCENTAGES OF PRINCIPAL AMOUNT)
SET FORTH BELOW PLUS ACCRUED AND UNPAID INTEREST, IF ANY, TO THE APPLICABLE
REDEMPTION DATE (SUBJECT TO THE RIGHT OF HOLDERS OF RECORD ON THE RELEVANT
RECORD DATE TO RECEIVE INTEREST AND LIQUIDATED DAMAGES DUE ON THE RELEVANT
INTEREST PAYMENT DATE), IF REDEEMED DURING THE TWELVE-MONTH PERIOD BEGINNING ON
FEBRUARY 1 OF THE YEARS INDICATED BELOW:

         YEAR                                               Percentage
         ----                                               ----------
         2005........................................       105.125%
         2006........................................       103.417%
         2007........................................       101.708%
         2008 and thereafter.........................       100.000%

         (B) NOTWITHSTANDING THE PROVISIONS OF SUBPARAGRAPH (A) OF THIS
PARAGRAPH 5, ON OR PRIOR TO FEBRUARY 1, 2004, THE COMPANY MAY ON ANY ONE OR MORE
OCCASIONS REDEEM UP TO 35% OF THE AGGREGATE PRINCIPAL AMOUNT OF NOTES ISSUED
UNDER THE INDENTURE AT A REDEMPTION PRICE EQUAL TO 110.250% OF THE PRINCIPAL
AMOUNT THEREOF ON THE REDEMPTION DATE WITH THE NET CASH PROCEEDS OF ONE OR MORE
PUBLIC EQUITY OFFERINGS AND/OR STRATEGIC EQUITY INVESTMENTS; PROVIDED THAT AT
LEAST 65% OF THE AGGREGATE PRINCIPAL AMOUNT OF NOTES ISSUED UNDER THE INDENTURE
REMAINS OUTSTANDING IMMEDIATELY AFTER THE OCCURRENCE OF SUCH REDEMPTION
(EXCLUDING NOTES HELD BY THE COMPANY OR ANY OF ITS SUBSIDIARIES);AND PROVIDED,
FURTHER, THAT SUCH REDEMPTION SHALL OCCUR WITHIN 60 DAYS OF THE DATE OF THE
CLOSING OF SUCH PUBLIC EQUITY OFFERING AND/OR STRATEGIC EQUITY INVESTMENT.

                                      A2-4


         6.  MANDATORY REDEMPTION. Except as set forth in paragraph 7 below, the
Company shall not be required to make mandatory redemption payments with respect
to the Notes.

         7.  REPURCHASE AT OPTION OF HOLDER.

         (a) Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to repurchase all or any part (equal
to $1,000 or an integral multiple thereof) of such Holder's Notes pursuant to
the offer described below (the "Change of Control Offer") at an offer price in
cash equal to 101% of the aggregate principal amount thereof plus accrued and
unpaid interest to the date of purchase (the "Change of Control Payment").
Within 30 days following any Change of Control, the Company shall mail a notice
to each Holder setting forth the procedures governing the Change of Control
Offer as required by the Indenture.

         (b) If the Company or a Restricted Subsidiary consummates any Asset
Sales, within five days of each date on which the aggregate amount of Excess
Proceeds exceeds $10 million, the Company shall commence an offer to all Holders
of Notes (as "Asset Sale Offer") pursuant to Section 3.09 of the Indenture to
purchase, on a pro rata basis, the maximum principal amount (or accreted value,
as applicable) of Notes and such other senior Indebtedness of the Company that
may be purchased out of the Excess Proceeds, at an offer price in cash in an
amount equal to 100% of the principal amount (or accreted value, as applicable)
thereof plus accrued and unpaid interest to the date of purchase (subject to the
right of Holders of record on the relevant record date to receive interest due
on the relevant interest payment date), in accordance with the procedures set
forth in the Indenture and such other senior Indebtedness of the Company. To the
extent that any Excess Proceeds remain after consummation of an Asset Sale
Offer, the Company may use such Excess Proceeds for any purpose not otherwise
prohibited by the Indenture. If the aggregate principal amount of Notes and such
other senior Indebtedness of the Company tendered into such Asset Sale Offer
surrendered by Holders thereof exceeds the amount of Excess Proceeds, the
Trustee shall select the Notes and such other senior Indebtedness to be
purchased on a pro rata basis. Upon completion of such offer to purchase, the
amount of Excess Proceeds shall be reset to zero. Holders of Notes that are the
subject of an offer to purchase will receive an Asset Sale Offer from the
Company prior to any related purchase date and may elect to have such Notes
purchased by completing the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes.

         8.  NOTICE OF REDEMPTION. Notice of redemption will be mailed at least
30 days but not more than 60 days before the redemption date to each Holder
whose Notes are to be redeemed at its registered address. Notes in denominations
larger than $1,000 may be redeemed in part but only in whole multiples of
$1,000, unless all of the Notes held by a Holder are to be redeemed. On and
after the redemption date interest ceases to accrue on Notes or portions thereof
called for redemption.

         9.  DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form
without coupons in denominations of $1,000 and integral multiples of $1,000. The
transfer of Notes may be registered and Notes may be exchanged as provided in
the Indenture. The Registrar and the Trustee may require a Holder, among other
things, to furnish appropriate

                                      A2-5


endorsements and transfer documents and the Company may require a Holder to pay
any taxes and fees required by law or permitted by the Indenture. The Registrar
need not exchange or register the transfer of any Note or portion of a Note
selected for redemption, except for the unredeemed portion of any Note being
redeemed in part. Also, the Company need not exchange or register the transfer
of any Notes for a period of 15 days before a selection of Notes to be redeemed
or during the period between a record date and the corresponding Interest
Payment Date.

         This Regulation S Temporary Global Note is exchangeable in whole or in
part for one or more Global Notes only (i) on or after the termination of the
40-day restricted period (as defined in Regulation S) and (ii) upon presentation
of certificates (accompanied by an Opinion of Counsel, if applicable) required
by Article 2 of the Indenture. Upon exchange of this Regulation S Temporary
Global Note for one or more Global Notes, the Trustee shall cancel this
Regulation S Temporary Global Note.

         10. PERSONS DEEMED OWNERS. The registered Holder of a Note may be
treated as its owner for all purposes.

         11. AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions,
the Indenture or the Notes may be amended or supplemented with the consent of
the Holders of at least 51% in aggregate principal amount of the then
outstanding Notes, and any existing default or compliance with any provision of
the Indenture or the Notes (other than a default in the payment of the principal
of, premium, if any, or interest on the Notes) may be waived with the consent of
the Holders of at least 51% of the aggregate principal amount of the then
outstanding Notes. Without the consent of any Holder of a Note, the Indenture or
the Notes may be amended or supplemented to cure any ambiguity, defect or
inconsistency, to provide for uncertificated Notes in addition to or in place of
certificated Notes, to provide for the assumption of the Company's obligations
to Holders of the Notes in case of a merger or consolidation, to make any change
that would provide any additional rights or benefits to the Holders of the Notes
or that does not adversely affect the legal rights under the Indenture of any
such Holder, or to comply with the requirements of the Commission in order to
effect or maintain the qualification of the Indenture under the Trust Indenture
Act.

         12. DEFAULTS AND REMEDIES. Events of Default include: (i) default for
30 days in the payment when due of interest on the Notes; (ii) default in
payment when due of principal of or premium, if any, on the Notes when the same
becomes due and payable at maturity, upon redemption (including in connection
with an offer to purchase) or otherwise, (iii) failure by the Company to comply
with Section 4.10, 4.15 or 5.01 of the Indenture; (iv) failure by the Company
for 30 days after notice to the Company by the Trustee or the Holders of at
least 25% in principal amount of the Notes then outstanding to comply with
certain other agreements in the Indenture or the Notes: (v) default under
certain other agreements relating to Indebtedness of the Company which default
(a) is caused by a failure to pay principal of or premium, if any, or interest
on such Indebtedness prior to the expiration of the grace period provided in
such Indebtedness on the date of such default ("Payment Default") or (b) results
in the acceleration of such Indebtedness prior to its express maturity and, in
each case, the principal amount of any such Indebtedness, together with the
principal amount of all other Indebtedness under which there has been a Payment
Default aggregates to $10.0 million or more; (vi) certain final

                                      A2-6


judgments for the payment of money aggregating in excess of $10.0 million that
remain undischarged for a period of 60 days; and (vii) certain events of
bankruptcy or insolvency with respect to the Company or any of its Restricted
Subsidiaries that is a Significant Subsidiary. If any Event of Default occurs
and is continuing, the Trustee or the Holders of at least 25% in principal
amount of the then outstanding Notes may declare all the Notes to be due and
payable. Notwithstanding the foregoing, in the case of an Event of Default
arising from certain events of bankruptcy or insolvency, all outstanding Notes
will become due and payable without further action or notice. Holders may not
enforce the Indenture or the Notes except as provided in the Indenture. Subject
to certain limitations, Holders of a majority in principal amount of the then
outstanding Notes may direct the Trustee in its exercise of any trust or power.
The Trustee may withhold from Holders of the Notes notice of any continuing
Default or Event of Default (except a Default or Event of Default relating to
the payment of principal or interest) if it determines that withholding notice
is in their interest. The Holders of a majority in aggregate principal amount of
the Notes then outstanding by notice to the Trustee may on behalf of the Holders
of all of the Notes waive any existing Default or Event of Default and its
consequences under the Indenture except a continuing Default or Event of Default
in the payment of interest on, or the principal of, the Notes. The Company is
required to deliver to the Trustee annually a statement regarding compliance
with the Indenture, and the Company is required upon becoming aware of any
Default or Event of Default, to deliver to the Trustee a statement specifying
such Default or Event of Default.

         13. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its individual or
any other capacity, may make loans to, accept deposits from, and perform
services for the Company or its Affiliates, and may otherwise deal with the
Company or its Affiliates, as if it were not the Trustee.

         14. NO RECOURSE AGAINST OTHERS. A director, officer, employee,
incorporator or stockholder, of the Company, as such, shall not have any
liability for any obligations of the Company under the Notes or the Indenture or
for any claim based on, in respect of, or by reason of, such obligations or
their creation. Each Holder by accepting a Note waives and releases all such
liability. The waiver and release are part of the consideration for the issuance
of the Notes.

         15. AUTHENTICATION. This Note shall not be valid until authenticated by
the manual signature of the Trustee or an authenticating agent.

         16. ABBREVIATIONS. Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

         17. ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES AND
RESTRICTED DEFINITIVE NOTES. In addition to the rights provided to Holders of
Notes under the Indenture, Holders of Restricted Global Notes and Restricted
Definitive Notes shall have all the rights set forth in the Registration Rights
Agreement dated as of February 2, 2001 between the Company and the parties named
on the signature pages thereof (the "Registration Rights Agreement").

                                      A2-7


         18. CUSIP NUMBERS. Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders. No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

         The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

         SBA Communications Corporation
         One Town Center Road
         Boca Raton, FL  33486
         Attention:  General Counsel

                                      A2-8


                                 ASSIGNMENT FORM

To assign this Note, fill in the form below: (I) or (we) assign and transfer
this Note to

- ------------------------------------------------------------------------------
(Insert assignee's soc. or tax I.D. no.)
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
(Print or type assignee's name, address and zip code)

and irrevocably appoint ______________________________________________________
to transfer this Note on the books of the Company.  The agent may substitute
another to act for him.

- ------------------------------------------------------------------------------

Date: ____________________   Your Signature: _________________________________
                                             (Sign exactly as your name appears
                                             on the face of this Note)

                             Tax Identification No: __________________________

Signature Guarantee.

(Participant in a recognized Signature
Guarantee Medallion Program)

                                      A2-9


                       OPTION OF HOLDER TO ELECT PURCHASE

         If you want to elect to have this Note purchased by the Company
pursuant to Section 4.10 or 4.15 of the Indenture, check the box below:

         [_] Section 4.10          [_] Section 4.15

         If you want to elect to have only part of the Note purchased by the
Company pursuant to Section 4.10 or Section 4.15 of the Indenture, state the
amount you elect to have purchased:

$________

Date: ____________________   Your Signature: ________________________________
                                             (Sign exactly as your name appears
                                             on the face of this Note)

                             Tax Identification No: _________________________

Signature Guarantee.

(Participant in a recognized Signature
Guarantee Medallion Program)

                                     A2-10


           SCHEDULE OF EXCHANGES OF REGULATION S TEMPORARY GLOBAL NOTE

         The following exchanges of a part of this Regulation S Temporary Global
Note for an interest in another Global Note, or of other Restricted Global Notes
for an interest in this Regulation S Temporary Global Note, have been made:



                                                                       Principal Amount
                            Amount of                                 of this Global Note       Signature of
                           decrease in         Amount of increase       following such       authorized officer
                        Principal Amount      in Principal Amount        decrease (or           of Trustee or
Date of Exchange       of This Global Note    of This Global Note          Increase)           Note Custodian
- ----------------       -------------------    -------------------          ---------           --------------
                                                                                   




                                     A2-11


                                    EXHIBIT B

                         FORM OF CERTIFICATE OF TRANSFER

SBA Communications Corporation
One Town Center Road
Boca Raton, FL  33486

[Registrar address block]

         Re:  10 1/4% Senior Notes Due 2009

         Reference is hereby made to the Indenture, dated as of February 2, 2001
(the "INDENTURE"), between SBA Communications Corporation, as issuer (the
"COMPANY"), and State Street Bank and Trust Company, as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

         ______________, (the "TRANSFEROR") owns and proposes to transfer the
Note[s] or interest in such Note[s] specified in Annex A hereto, in the
principal amount of $___________ in such Note[s] or interests (the "TRANSFER"),
to __________ (the "TRANSFEREE"), as further specified in Annex A hereto. In
connection with the Transfer, the Transferor hereby certifies that:

1.   [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN THE
144A GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO RULE 144A. The Transfer is
being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
accordingly, the Transferor hereby further certifies that the beneficial
interest or Definitive Note is being transferred to a Person that the Transferor
reasonably believed and believes is purchasing the beneficial interest or
Definitive Note for its own account, or for one or more accounts with respect to
which such Person exercises sole investment discretion, and such Person and each
such account is a "qualified institutional buyer" within the meaning of Rule
144A in a transaction meeting the requirements of Rule 144A and such Transfer is
in compliance with any applicable blue sky securities laws of any state of the
United States. Upon consummation of the proposed Transfer in accordance with the
terms of the Indenture, the transferred beneficial interest or Definitive Note
will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the 144A Global Note and/or the Definitive Note and
in the Indenture and the Securities Act.

2.   [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL INTEREST IN THE
TEMPORARY REGULATION S GLOBAL NOTE, THE REGULATION S GLOBAL NOTE OR A DEFINITIVE
NOTE PURSUANT TO REGULATION S. The Transfer is being effected pursuant to and in
accordance with Rule 903 or Rule 904 under the Securities Act and, accordingly,
the Transferor hereby further certifies that (i) the Transfer is not being made
to a person in the United States and (x) at the time the buy order was
originated, the Transferee was outside the United States or such Transferor and
any Person acting on its behalf reasonably believed and believes that the
Transferee was outside the United States or (y) the transaction was executed in,
on or through the facilities of a designated offshore securities

                                      B-1


market and neither such Transferor nor any Person acting on its behalf knows
that the transaction was prearranged with a buyer in the United States, (ii) no
directed selling efforts have been made in contravention of the requirements of
Rule 903(b) or Rule 904(b) of Regulation S under the Securities Act (iii) the
transaction is not part of a plan or scheme to evade the registration
requirements of the Securities Act and (iv) if the proposed transfer is being
made prior to the expiration of the Restricted Period, the transfer is not being
made to a U.S. Person or for the account or benefit of a U.S. Person (other than
an Initial Purchaser). Upon consummation of the proposed transfer in accordance
with the terms of the Indenture, the transferred beneficial interest or
Definitive Note will be subject to the restrictions on Transfer enumerated in
the Private Placement Legend printed on the Regulation S Global Note, the
Temporary Regulation S Global Note and/or the Definitive Note and in the
Indenture and the Securities Act.

3.   [_] CHECK AND COMPLETE IF TRANSFEREE WILL TAKE DELIVERY OF A BENEFICIAL
INTEREST IN AN IAI GLOBAL NOTE OR A DEFINITIVE NOTE PURSUANT TO ANY PROVISION OF
THE SECURITIES ACT OTHER THAN RULE 144A OR REGULATION S. The Transfer is being
effected in compliance with the transfer restrictions applicable to beneficial
interests in Restricted Global Notes and Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act and any applicable blue
sky securities laws of any state of the United States, and accordingly the
Transferor hereby further certifies that (check one):

         (a) [_] such Transfer is being effected pursuant to and in accordance
with Rule 144 under the Securities Act;

                                       or

         (b) [_] such Transfer is being effected to the Company or a subsidiary
thereof;

                                       or

         (c) [_] such Transfer is being effected pursuant to an effective
registration statement under the Securities Act and in compliance with the
prospectus delivery requirements of the Securities Act.

                                       or

         (d) [_] such Transfer is being effected to an Institutional Accredited
Investor and pursuant to an exemption from the registration requirements of the
Securities Act other than Rule 144A, Rule 144 or Rule 904, and the Transferor
hereby further certifies that it has not engaged in any general solicitation
within the meaning of Regulation D under the Securities Act and the Transfer
complies with the transfer restrictions applicable to beneficial interests in a
Restricted Global Note or Restricted Definitive Notes and the requirements of
the exemption claimed, which certification is supported by (1) a certificate
executed by the Transferee in the form of Exhibit D to the Indenture and (2) an
Opinion of Counsel provided by the Transferor or the Transferee (a copy of which
the Transferor has attached to this certification), to the effect that such
Transfer is in compliance with the Securities Act. Upon consummation of the
proposed transfer in accordance with the terms of the Indenture, the transferred
beneficial interest or

                                      B-2


Definitive Note will be subject to the restrictions on transfer enumerated in
the Private Placement Legend printed on the IAI Global Note and/or the
Definitive Notes and in the Indenture and the Securities Act.

4.   [_] Check if Transferee will take delivery of a beneficial interest in an
Unrestricted Global Note or of an Unrestricted Definitive Note.

         (a) [_] CHECK IF TRANSFER IS PURSUANT TO RULE 144. (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any state of the United States
and (ii) the restrictions on transfer contained in the Indenture and the Private
Placement Legend are not required in order to maintain compliance with the
Securities Act. Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will no longer be subject to the restrictions on transfer enumerated in the
Private Placement Legend printed on the Restricted Global Notes, on Restricted
Definitive Notes and in the Indenture.

         (b) [_] CHECK IF TRANSFER IS PURSUANT TO REGULATION S. (i) The Transfer
is being effected pursuant to and in accordance with Rule 903 or Rule 904 under
the Securities Act and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any state of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will no longer be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the Restricted
Global Notes, on Restricted Definitive Notes and in the Indenture.

         (c) [_] CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION. (i) The
Transfer is being effected pursuant to and in compliance with an exemption from
the registration requirements of the Securities Act other than Rule 144, Rule
903 or Rule 904 and in compliance with the transfer restrictions contained in
the Indenture and any applicable blue sky securities laws of any State of the
United States and (ii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act. Upon consummation of the proposed Transfer
in accordance with the terms of the Indenture, the transferred beneficial
interest or Definitive Note will not be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes or Restricted Definitive Notes and in the Indenture.

                                      B-3


         This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                                          --------------------------------------
                                          [Insert Name of Transferor]

                                          By:  _________________________________
                                               Name:
                                               Title:
Dated: _________, ____

                                      B-4


                       ANNEX A TO CERTIFICATE OF TRANSFER

1.       The Transferor owns and proposes to transfer the following:

                            [CHECK ONE OF (a) OR (b)]

              (a) [_]  a beneficial interest in the :

                  (i)  [_] 144A Global Note (CUSIP _________), or

                  (ii) [_] Regulation S Global Note (CUSIP _________), or

                  (iii)[_] IAI Global Note (CUSIP _________), or

              (b) [_]  a Restricted Definitive Note.

2.       After the Transfer the Transferee will hold:

                                   [CHECK ONE]

              (a) [_]  a beneficial interest in the:

                  (i)  [_] 144A Global Note (CUSIP ________), or

                  (ii) [_] Regulation S Global Note (CUSIP ________), or

                  (iii)[_] IAI Global Note (CUSIP _________), or

                  (iv) [_] Unrestricted Global Note (CUSIP ________); or

              (b) [_]  a Restricted Definitive Note; or

              (c) [_]  an Unrestricted Definitive Note,

in accordance with the terms of the Indenture.

                                      B-5


                                    EXHIBIT C

                         FORM OF CERTIFICATE OF EXCHANGE

SBA Communications Corporation
One Town Center Road
Boca Raton, FL  33486

[Registrar address block]*

        Re:  10 1/4%  SENIOR DISCOUNT NOTES DUE 2009

                              (CUSIP______________)

         Reference is hereby made to the Indenture, dated as of February 2, 2001
(the "INDENTURE"), between SBA Communications Corporation, as issuer (the
"COMPANY"), and State Street Bank and Trust Company, as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

         ____________, (the "OWNER") owns and proposes to exchange the Note[s]
or interest in such Note[s] specified herein, in the principal amount of
$____________ in such Note[s] or interests (the "Exchange"). In connection with
the Exchange, the Owner hereby certifies that:

1.  EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN A
RESTRICTED GLOBAL NOTE FOR UNRESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
IN AN UNRESTRICTED GLOBAL NOTE

         (a) [_] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A RESTRICTED
GLOBAL NOTE TO BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In connection
with the Exchange of the Owner's beneficial interest in a Restricted Global Note
for a beneficial interest in an Unrestricted Global Note in an equal principal
amount, the Owner hereby certifies (i) the beneficial interest is being acquired
for the Owner's own account without transfer, (ii) such Exchange has been
effected in compliance with the transfer restrictions applicable to the Global
Notes and pursuant to and in accordance with the United States Securities Act of
1933, as amended (the "SECURITIES ACT"), (iii) the restrictions on transfer
contained in the Indenture and the Private Placement Legend are not required in
order to maintain compliance with the Securities Act and (iv) the beneficial
interest in an Unrestricted Global Note is being acquired in compliance with any
applicable blue sky securities laws of any state of the United States.

         (b) [_] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A RESTRICTED
GLOBAL NOTE TO UNRESTRICTED DEFINITIVE NOTE. In connection with the Exchange of
the Owner's beneficial interest in a Restricted Global Note for an Unrestricted
Definitive Note, the Owner hereby certifies (i) the Definitive Note is being
acquired for the Owner's own account without transfer, (ii) such Exchange has
been effected in compliance with the transfer restrictions applicable to the
Restricted Global Notes and pursuant

                                      C-1


to and in accordance with the Securities Act, (iii) the restrictions on transfer
contained in the Indenture and the Private Placement Legend are not required in
order to maintain compliance with the Securities Act and (iv) the Definitive
Note is being acquired in compliance with any applicable blue sky securities
laws of any state of the United States.

         (c) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
BENEFICIAL INTEREST IN AN UNRESTRICTED GLOBAL NOTE. In connection with the
Owner's Exchange of a Restricted Definitive Note for a beneficial interest in an
Unrestricted Global Note, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer, (ii) such
Exchange has been effected in compliance with the transfer restrictions
applicable to Restricted Definitive Notes and pursuant to and in accordance with
the Securities Act, (iii) the restrictions on transfer contained in the
Indenture and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest is being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

         (d) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
UNRESTRICTED DEFINITIVE NOTE. In connection with the Owner's Exchange of a
Restricted Definitive Note for an Unrestricted Definitive Note, the Owner hereby
certifies (i) the Unrestricted Definitive Note is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

2.  EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS IN
RESTRICTED GLOBAL NOTES FOR RESTRICTED DEFINITIVE NOTES OR BENEFICIAL INTERESTS
IN RESTRICTED GLOBAL NOTES

         (a) [_] CHECK IF EXCHANGE IS FROM BENEFICIAL INTEREST IN A RESTRICTED
GLOBAL NOTE TO RESTRICTED DEFINITIVE NOTE. In connection with the Exchange of
the Owner's beneficial interest in a Restricted Global Note for a Restricted
Definitive Note with an equal principal amount, the Owner hereby certifies that
the Restricted Definitive Note is being acquired for the Owner's own account
without transfer. Upon consummation of the proposed Exchange in accordance with
the terms of the Indenture, the Restricted Definitive Note issued will continue
to be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the Restricted Definitive Note and in the Indenture
and the Securities Act.

         (b) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTE TO
BENEFICIAL INTEREST IN A RESTRICTED GLOBAL NOTE. In connection with the Exchange
of the Owner's Restricted Definitive Note for a beneficial interest in the
[CHECK ONE] 144A Global Note, Regulation S Global Note, IAI Global Note, with an
equal principal amount, the Owner hereby certifies (i) the beneficial interest
is being acquired for the Owner's own account without transfer and (ii) such
Exchange has been effected in compliance

                                      C-2


with the transfer restrictions applicable to the Restricted Global Notes and
pursuant to and in accordance with the Securities Act, and in compliance with
any applicable blue sky securities laws of any state of the United States. Upon
consummation of the proposed Exchange in accordance with the terms of the
Indenture, the beneficial interest issued will be subject to the restrictions on
transfer enumerated in the Private Placement Legend printed on the relevant
Restricted Global Note and in the Indenture and the Securities Act.

         This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                                          --------------------------------------
                                          [Insert Name of Transferor]


                                          By:  _________________________________
                                               Name:
                                               Title:


Dated: _________, ____

                                      C-3


                                    EXHIBIT D

                            FORM OF CERTIFICATE FROM
                   ACQUIRING INSTITUTIONAL ACCREDITED INVESTOR

SBA Communications Corporation
One Town Center Road
Boca Raton, Florida 33486

State Street Bank and Trust Company
2 International Place
Boston, Massachusetts 02110

         Re:  SBA COMMUNICATIONS CORPORATION 10 1/4% SENIOR NOTES DUE 2009

         Reference is hereby made to the Indenture, dated as of February 2, 2001
(the "INDENTURE"), between SBA Communications Corporation, as issuer (the
"COMPANY"), and State Street Bank and Trust Company, as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

         In connection with our proposed purchase of $____________ aggregate
principal amount of:

         (a) [_]  a beneficial interest in a Global Note, or

         (b) [_]  a Definitive Note,

         we confirm that:

         1.  We understand that any subsequent transfer of the Senior Notes or
any interest therein is subject to certain restrictions and conditions set forth
in the Indenture and the undersigned agrees to be bound by, and not to resell,
pledge or otherwise transfer the Senior Notes or any interest therein except in
compliance with, such restrictions and conditions and the United States
Securities Act of 1933, as amended (the "SECURITIES ACT").

         2.  We understand that the offer and sale of the Senior Notes have not
been registered under the Securities Act, and that the Senior Notes and any
interest therein may not be offered or sold except as permitted in the following
sentence. We agree, on our own behalf and on behalf of any accounts for which we
are acting as hereinafter stated, that if we should sell the Senior Notes or any
interest therein, we will do so only (A) to the Company or any subsidiary
thereof, (B) in accordance with Rule 144A under the Securities Act to a
"qualified institutional buyer" (as defined therein), (C) to an institutional
"accredited investor" (as defined below) that, prior to such transfer, furnishes
(or has furnished on its behalf by a U.S. broker-dealer) to you and to the
Company a signed letter substantially in the form of this letter and an Opinion
of Counsel in form reasonably acceptable to the Company to the effect that such
transfer is in compliance with the Securities Act, (D) outside the United States
in accordance with Rule 904 of Regulation S under the Securities Act, (E)
pursuant to the provisions of Rule 144(k) under the Securities Act or (F)
pursuant to an effective registration statement under the Securities Act, and

                                      D-1


we further agree to provide to any person purchasing the Definitive Note or
beneficial interest in a Global Note from us in a transaction meeting the
requirements of clauses (A) through (E) of this paragraph a notice advising such
purchaser that resales thereof are restricted as stated herein.

         3.  We understand that, on any proposed resale of the Senior Notes or
beneficial interest therein, we will be required to furnish to you and the
Company such certifications, legal opinions and other information as you and the
Company may reasonably require to confirm that the proposed sale complies with
the foregoing restrictions. We further understand that the Senior Notes
purchased by us will bear a legend to the foregoing effect.

         4.  We are an institutional "accredited investor" (as defined in Rule
501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and have
such knowledge and experience in financial and business matters as to be capable
of evaluating the merits and risks of our investment in the Senior Notes, and we
and any accounts for which we are acting are each able to bear the economic risk
of our or its investment.

         5.  We are acquiring the Senior Notes or beneficial interest therein
purchased by us for our own account or for one or more accounts (each of which
is an institutional "accredited investor") as to each of which we exercise sole
investment discretion.

         You and the Company are entitled to rely upon this letter and are
irrevocably authorized to produce this letter or a copy hereof to any interested
party in any administrative or legal proceedings or official inquiry with
respect to the matters covered hereby.

                                       --------------------------------------
                                       [Insert Name of Accredited Investor]


                                       By:  _________________________________
                                            Name:
                                            Title:

Dated: __________________, ____

                                      D-2


                                    EXHIBIT E

                         FORM OF SUPPLEMENTAL INDENTURE
                    TO BE DELIVERED BY SUBSEQUENT GUARANTORS

         Supplemental Indenture (this "Supplemental Indenture"), dated as of
________________, among __________________ (the "Guaranteeing Subsidiary"), a
subsidiary of SBA COMMUNICATIONS CORPORATION (or its permitted successor), a
Florida corporation (the "Company"), the Company, the other Subsidiary
Guarantors (as defined in the Indenture referred to herein) and STATE STREET
BANK AND TRUST COMPANY, as trustee under the Indenture referred to below (the
"Trustee").

                               W I T N E S S E T H

         WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the "Indenture"), dated as of February 2, 2001 providing
for the issuance of an aggregate principal amount of up to $500,000,000 of 10
1/4% Senior Notes due 2009 (the "Notes");

         WHEREAS, the Indenture provides that under certain circumstances the
Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental
indenture pursuant to which the Guaranteeing Subsidiary shall unconditionally
guarantee all of the Company's Obligations under the Notes and the Indenture on
the terms and conditions set forth herein (the "Note Guarantee"); and

         WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

         NOW THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, the receipt of which is hereby acknowledged, the
Guaranteeing Subsidiary and the Trustee mutually covenant and agree for the
equal and ratable benefit of the Holders of the Notes as follows:

         1.  CAPITALIZED TERMS. Capitalized terms used herein without definition
shall have the meanings assigned to them in the Indenture.

         2.  AGREEMENT TO GUARANTEE. The Guaranteeing Subsidiary hereby agrees
as follows:

         (a)      Along with all Subsidiary Guarantors named in the Indenture,
                  to jointly and severally Guarantee to each Holder of a Note
                  authenticated and delivered by the Trustee and to the Trustee
                  and its successors and assigns, irrespective of the validity
                  and enforceability of the Indenture, the Notes or the
                  obligations of the Company hereunder or thereunder, that:

                  (i)      the principal of and interest on the Notes will be
                           promptly paid in full when due, whether at maturity,
                           by acceleration, redemption or otherwise, and
                           interest on the overdue principal of and interest on

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                           the Notes, if any, if lawful, and all other
                           obligations of the Company to the Holders or the
                           Trustee hereunder or thereunder will be promptly paid
                           in full or performed, all in accordance with the
                           terms hereof and thereof; and

                  (ii)     in case of any extension of time of payment or
                           renewal of any Notes or any of such other
                           obligations, that same will be promptly paid in full
                           when due or performed in accordance with the terms of
                           the extension or renewal, whether at stated maturity,
                           by acceleration or otherwise. Failing payment when
                           due of any amount so guaranteed or any performance so
                           guaranteed for whatever reason, the Subsidiary
                           Guarantors shall be jointly and severally obligated
                           to pay the same immediately.

         (b)      The obligations hereunder shall be unconditional, irrespective
                  of the validity, regularity or enforceability of the Notes or
                  the Indenture, the absence of any action to enforce the same,
                  any waiver or consent by any Holder of the Notes with respect
                  to any provisions hereof or thereof, the recovery of any
                  judgment against the Company, any action to enforce the same
                  or any other circumstance which might otherwise constitute a
                  legal or equitable discharge or defense of a guarantor.

         (c)      The following is hereby waived: diligence, presentment, demand
                  of payment, filing of claims with a court in the event of
                  insolvency or bankruptcy of the Company, any right to require
                  a proceeding first against the Company, protest, notice and
                  all demands whatsoever.

         (d)      This Note Guarantee shall not be discharged except by complete
                  performance of the obligations contained in the Notes and the
                  Indenture.

         (e)      If any Holder or the Trustee is required by any court or
                  otherwise to return to the Company, the Subsidiary Guarantors,
                  or any Custodian, Trustee, liquidator or other similar
                  official acting in relation to either the Company or the
                  Subsidiary Guarantors, any amount paid by either to the
                  Trustee or such Holder, this Note Guarantee, to the extent
                  theretofore discharged, shall be reinstated in full force and
                  effect.

         (f)      The Guaranteeing Subsidiary shall not be entitled to any right
                  of subrogation in relation to the Holders in respect of any
                  obligations guaranteed hereby until payment in full of all
                  obligations guaranteed hereby.

         (g)      As between the Subsidiary Guarantors, on the one hand, and the
                  Holders and the Trustee, on the other hand, (x) the maturity
                  of the obligations guaranteed hereby may be accelerated as
                  provided in Article 6 of the Indenture for the purposes of
                  this Note Guarantee, notwithstanding any stay, injunction or
                  other prohibition preventing such acceleration in

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                  respect of the obligations guaranteed hereby, and (y) in the
                  event of any declaration of acceleration of such obligations
                  as provided in Article 6 of the Indenture, such obligations
                  (whether or not due and payable) shall forthwith become due
                  and payable by the Subsidiary Guarantors for the purpose of
                  this Note Guarantee.

         (h)      The Subsidiary Guarantors shall have the right to seek
                  contribution from any non-paying Subsidiary Guarantor so long
                  as the exercise of such right does not impair the rights of
                  the Holders under the Guarantee.

         3.  EXECUTION AND DELIVERY. Each Guaranteeing Subsidiary agrees that
the Note Guarantees shall remain in full force and effect notwithstanding any
failure to endorse on each Note a notation of such Note Guarantee.

         4.  GUARANTEEING SUBSIDIARY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS.

         (a)      In case of any consolidation or merger of the Guaranteeing
                  Subsidiary with another corporation, Person or entity, and
                  upon the assumption by the successor corporation, by
                  supplemental indenture, executed and delivered to the Trustee
                  and satisfactory in form to the Trustee, of the Note Guarantee
                  endorsed upon the Notes and the due and punctual performance
                  of all of the covenants and conditions of the Indenture to be
                  performed by the Subsidiary Guarantor, such successor
                  corporation shall succeed to and be substituted for the
                  Subsidiary Guarantor with the same effect as if it had been
                  named herein as a Subsidiary Guarantor. Such successor
                  corporation thereupon may cause to be signed any or all of the
                  Note Guarantees to be endorsed upon all of the Notes issuable
                  hereunder which theretofore shall not have been signed by the
                  Company and delivered to the Trustee. All the Note Guarantees
                  so issued shall in all respects have the same legal rank and
                  benefit under the Indenture as the Note Guarantees theretofore
                  and thereafter issued in accordance with the terms of the
                  Indenture as though all of such Note Guarantees had been
                  issued at the date of the execution hereof.

         (b)      Except as set forth in Articles 4 and 5 of the Indenture, and
                  notwithstanding clause (a) above, nothing contained in the
                  Indenture or in any of the Notes shall prevent any
                  consolidation or merger of a Subsidiary Guarantor with or into
                  the Company or another Subsidiary Guarantor, or shall prevent
                  any sale or conveyance of the property of a Subsidiary
                  Guarantor as an entirety or substantially as an entirety to
                  the Company or another Subsidiary Guarantor.

         5.  NO RECOURSE AGAINST OTHERS. No past, present or future director,
officer, employee, incorporator, stockholder or agent of the Guaranteeing
Subsidiary, as such, shall have any liability for any obligations of the Company
or any Guaranteeing Subsidiary under the Notes, any Note Guarantees, the
Indenture or this Supplemental Indenture or for any claim based on, in respect
of, or by reason of, such obligations or their creation. Each Holder of the
Notes by

                                      E-3


accepting a Note waives and releases all such liability. The waiver and release
are part of the consideration for issuance of the Notes. Such waiver may not be
effective to waive liabilities under the federal securities laws and it is the
view of the Commission that such a waiver is against public policy.

         6.  NEW YORK LAW TO GOVERN. THE INTERNAL LAW OF THE STATE OF NEW YORK
SHALL GOVERN AND BE USED TO CONSTRUE THIS SUPPLEMENTAL INDENTURE.

         7.  COUNTERPARTS. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement.

         8.  EFFECT OF HEADINGS. The Section headings herein are for convenience
only and shall not affect the construction hereof.

         9.  THE TRUSTEE. The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiary and the Company.

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         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed and attested, all as of the date first above
written.

Dated:  _______________, ____

                                       [Guaranteeing Subsidiary]


                                       By:  ______________________________
                                            Name:
                                            Title:


                                       [COMPANY]

                                       By:  ______________________________
                                            Name:
                                            Title:


                                       [EXISTING SUBSIDIARY GUARANTORS]


                                       By:  ______________________________
                                            Name:
                                            Title:


                                       [TRUSTEE]
                                       as Trustee

                                       By:  ______________________________
                                            Name:
                                            Title:

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