EXHIBIT 3.2
                                                                    -----------
 
                             ARTICLES OF AMENDMENT
                      TO THE ARTICLES OF INCORPORATION OF
                         SBA COMMUNICATIONS CORPORATION

                              AMENDED AND RESTATED
                 STATEMENT OF DESIGNATION, PREFERENCES, RIGHTS
                       AND LIMITATIONS AMENDING TERMS OF
                  4% SERIES A CONVERTIBLE PREFERRED STOCK, 4%
         SERIES B REDEEMABLE PREFERRED STOCK, 4% SERIES C CONVERTIBLE 
         PREFERRED STOCK AND 4% SERIES D REDEEMABLE PREFERRED STOCK OF
                         SBA COMMUNICATIONS CORPORATION

     RESOLVED, that on February 4, 1998, the Board of Directors and shareholders
of the Corporation desired that the preferences and relative, participating,
optional or other special rights, and the qualifications, limitations or
restrictions of the 4% Series A Preferred Stock, $.01 par value per share,
consisting of 8,050,000 shares issued and authorized, the 4% Series B Redeemable
Preferred Stock, $.01 par value per share, consisting of 8,050,000 shares
authorized, no shares issued, the 4% Series C Convertible Preferred Stock, par
value $.01 per share, consisting of up to 4,472,272 shares authorized, no shares
issued, and the 4% Series D Redeemable Preferred Stock, par value $.01 per
share, consisting of up to 4,472,272 shares authorized, no shares issued, shall
be amended and restated as set forth in the Amended and Restated Statement of
Designation, Preferences, Rights and Limitations, as follows:

                   A. 4% SERIES A CONVERTIBLE PREFERRED STOCK
                   ------------------------------------------

1.   Dividends.
     --------- 

     (a) The holders of outstanding shares of Series A Preferred Stock shall be
entitled, in preference to the holders of any and all other classes of capital
stock of the Corporation (other than the Series B Preferred Stock, the Series C
Preferred Stock, and the Series D Preferred Stock, which will rank equally with
the Series A Preferred Stock as to dividends), to receive, out of any funds
legally available therefore, cumulative dividends on the Series A Preferred
Stock in cash, at the rate per annum of four percent (4%) of the Series A Base
Liquidation Amount (as defined in Section A.2 below), subject to proration for
partial years on the basis of a 365-day year ("Series A Cumulative Preference
Dividends").  Such dividends will accumulate commencing as of the date of
issuance of the Series A Preferred Stock and will be cumulative, to the extent
unpaid, whether or not they have been declared and whether or not there are
profits, surplus or other funds of the Corporation legally available for the
payment of dividends.  Accrued but unpaid dividends on the Series A Preferred
Stock shall be payable upon  conversion of the Series A Preferred Stock into
Class A Common Stock and Series B Preferred Stock.  Dividends paid in cash in an
amount less than the total amount of such dividends at the time accumulated and
payable on all outstanding shares of Series A Preferred Stock, including
fractions, shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding.  At any time when shares of Series A Preferred
Stock are outstanding and the Series A Cumulative Preference Dividends have not
been paid in full in cash: (i) no dividend whatsoever shall be paid or declared,
and no distribution shall be made, on any capital stock of the Corporation
ranking junior to the Series A Preferred Stock; and no shares of capital stock
of the

 
Corporation ranking junior to the Series A Preferred Stock shall be purchased,
redeemed or acquired by the Corporation and no monies shall be paid into or set
aside or made available for a sinking fund for the purchase, redemption or
acquisition thereof.  All numbers relating to the calculation of dividends
pursuant to this Section A.1(a) shall be subject to equitable adjustment in the
event of any stock split, combination, reorganization, recapitalization,
reclassification or other similar event involving a change in the Series A
Preferred Stock.  At the time of the fifth anniversary following the initial
sale of the Series A Preferred Stock, the dividend rate on the Series A
Preferred Stock shall increase to 8% of the Series A Base Liquidation Amount per
annum.  On the sixth anniversary date, the dividend rate on the Series A
Preferred Stock shall increase to 14% of the Series A Base Liquidation Amount
per annum.

     (b) Notwithstanding the foregoing, while any of the Corporation's Senior
Discount Notes Due 2008, or any refinancing thereof (the "Senior Notes") remain
outstanding, the Corporation shall not be permitted to pay any cash dividends
upon the Series A Preferred Stock (including any such dividends payable in
connection with a conversion of the Series A Preferred Stock) and the holders of
the Series A Preferred Stock shall not be entitled to receive any such
dividends, if and to the extent that such dividends would be prohibited by any
term or provision of the indenture governing the Senior Notes issued by the
Corporation on or prior to April 1, 1998, as the same is in effect on the date
of original issuance of the Senior Notes and as may be amended, supplemented or
modified from time to time (the "Indenture"), or any documents relating to any
refinancing of the Senior Notes; provided that the covenant under the caption
                                 --------                                    
"Restricted Payments" in the Indenture, or any documents relating to any
refinancing of the Senior Notes, will not be materially more restrictive with
regard to payments than the restrictions set forth in the covenant under the
caption "Certain Covenants--Restricted Payments" set forth in the Company's
final Offering Memorandum, dated February 25, 1998 (the "Referenced Document"),
and provided further that no such amendment, supplement or modification of the
    ----------------                                                          
Indenture, or any documents relating to any refinancing of the Senior Notes,
shall (i) increase the aggregate principal amount of Senior Notes outstanding,
(ii) be materially more restrictive with regard to payments than the
restrictions set forth in the covenant under the caption "Certain Covenants--
Restricted Payments" in the Referenced Document or (iii) extend the maturity of
the Senior Notes.  Any change that will prohibit a payment that would otherwise
be permitted pursuant to the Referenced Document will be deemed material.

2.   Liquidation Preferences.
     ----------------------- 

     (a) In the event of any distribution of assets upon any voluntary or
involuntary liquidation, dissolution or winding up of the Corporation, including
by consolidation, merger, share exchange or sale of all or substantially all of
the assets of the Corporation (in each case, an "Event of Dissolution"), each
holder of outstanding shares of Series A Preferred Stock shall be entitled to be
paid out of the assets of the Corporation available for distribution to
stockholders, whether such assets are capital, surplus, or earnings, and before
any amount shall be paid or distributed to the holders of  Class A Common Stock
or Class B Common Stock or of any other stock ranking on liquidation junior to
the Series A Preferred Stock (other than the Series B Preferred Stock, the
Series C Preferred Stock, and the Series D Preferred Stock, which will rank
equally with the Series A Preferred Stock in an Event of Dissolution) an amount
in cash equal to the greater of (i) the sum of (a) $3.726708075 per share
(adjusted appropriately for stock splits, stock 

                                       2

 
dividends, recapitalizations and the like with respect to the Series A Preferred
Stock), plus (b) any accumulated but unpaid dividends to which such holder of
outstanding shares of Series A Preferred Stock is entitled pursuant to Section
A.1 hereof (the sum of (a) and (b) being referred to as the "Series A Base
Liquidation Amount") or (ii) the amount per share of Series A Preferred Stock
which the holders thereof would have received if all such shares had been
converted to Class A Common Stock and Series B Preferred Stock pursuant to
Sections A.5, A.6 or A.7 hereof immediately prior to such Event of Dissolution,
less any amount previously distributed on such shares in connection with such
Event of Dissolution; provided, however, that if, upon any Event of Dissolution,
                      --------  ------- 
the amounts payable with respect to the Series A Preferred Stock are not paid in
full, the holders of the Series A Preferred Stock shall share ratably in any
distribution of assets in proportion to the full respective preferential amounts
to which they are entitled.

     (b)  After full payment shall have been made to the holders of shares of
the Series A Preferred Stock (and Series B Preferred Stock, Series C Preferred
Stock and Series D Preferred Stock in accordance with Sections B.2, C.2 and D.2,
respectively), any balance of the assets of the Corporation then remaining shall
be allocated to the holders of shares of other classes of stock ranking junior
to the Series A Preferred Stock, including the holders of Class A Common Stock
and Class B Common Stock, in accordance with the respective interests therein.

3.   Voting Rights.
     ------------- 

     (a) Except as otherwise expressly provided in these Amended and Restated
Articles of Incorporation, or as required by the Florida Business Corporation
Act (the "FBCA"), the holders of shares of Series A Preferred Stock shall vote
together with the holders of Class A Common Stock, Class B Common Stock and
Series C Preferred Stock as a single voting group on all actions to be taken by
the shareholders of the Corporation.  Each share of Series A Preferred Stock
shall entitle the holder thereof to such number of votes per share on each such
action as shall equal (i) the largest number of whole shares of Class A Common
Stock into which such shares of Series A Preferred Stock could be converted,
pursuant to the provisions of Sections A.5, A.6 or A.7 hereof, multiplied by
(ii) ten (10) at the record date for the determination of shareholders entitled
to vote on such matter or, if no such record date is established, at the date
such vote is taken or any written consent of shareholders is solicited.

     (b)  Except as expressly provided herein or as required by law, as long as
20% or more of the greatest number of shares of Series A Preferred Stock issued
remain outstanding, the Corporation shall not, without the approval by vote or
written consent of the holders of at least 66% of the outstanding shares of
Series A Preferred Stock; (i) authorize or issue any class or series of equity
securities having equal or superior rights to the Series A Preferred Stock as to
payment upon liquidation, dissolution or a winding up of the Corporation; (ii)
enter into any agreement that would restrict the Corporation's ability to
perform under any purchase agreement executed by the Corporation in connection
with an issuance of Series A Preferred Stock; (iii) amend its Articles of
Incorporation or Bylaws in any way which adversely affects the rights and
preferences of the holders of Series A Preferred Stock as a class; (iv) sell or
lease 20% or more of its assets, except in the ordinary course of business; (v)
issue additional securities to employees, officers 

                                       3

 
or directors, except securities issuable upon the exercise of options and
warrants outstanding immediately prior to the issuance of any Series A Preferred
Stock, or issuable upon the exercise of options granted in the future at fair
market value; (vi) issue any securities for a price less than fair market value,
other than as may be required by contractual commitments existing prior to the
issuance of any Series A Preferred Stock; or (vii) adopt any stock option plan
other than the Corporation's 1996 Stock Option Plan or increase the number of
shares available for issuance under such plan.

     (c) The holders of the Series A Preferred Stock and Series C Preferred
Stock, voting together as a single class, shall be entitled to elect two-fifths
(2/5) of the number of directors on the Board of Directors of the Corporation.

4.   Redemption.
     ---------- 

     (a) Commencing on the fifth anniversary of the initial sale of the Series A
Preferred Stock (the "Redemption Commencement Date"), the Corporation shall, to
the extent it may do so under applicable law, redeem all of the outstanding
shares of Series A Preferred Stock at a price equal to the Series A Base
Liquidation Amount at the time of redemption.  Such redemption shall occur in
two payments, the first to occur on the Redemption Commencement Date and the
second to occur one (1) year thereafter (each a "Payment Date").  Each payment
(a "Redemption Payment") shall be in an amount equal to one-half of the Series A
Base Liquidation Amount calculated as of the date of such payment, with the
final Redemption Payment in an amount necessary to fully redeem all remaining
outstanding Series A Preferred Stock at a price equal to the Series A Base
Liquidation Amount.

     (b) On each Payment Date, the Corporation shall redeem shares of Series A
Preferred Stock ratably from the holders thereof to the extent of the Redemption
Payment due on such date, according to the respective amounts which would be
payable with respect to the full number of Series A Preferred Stock to be
redeemed from them on such date, as if all such Series A Preferred Stock were
redeemed in full.  The Redemption Payment shall be payable in cash in
immediately available funds on the Payment Date.  Any outstanding shares of
Series A Preferred Stock not redeemed shall remain outstanding.  All shares of
Series A Preferred Stock which are to be redeemed hereunder shall remain issued
and outstanding until the Redemption Price therefor has been indefeasibly paid
in full in cash or has been deposited with an independent payment agent pursuant
to Section A.4(c).  Any Series A Preferred Stock which would otherwise be
redeemed on a Payment Date may be converted by the holder thereof to Class A
Common Stock and Series B Preferred Stock, in accordance with the provisions
hereof, at any time prior to the close of business on the last business day next
preceding such Payment Date.

     (c) On or before the Redemption Commencement Date, the Corporation will
give written notice by mail, postage prepaid to the holders of record of Series
A Preferred Stock to be redeemed, such notice to be addressed to each such
holder at its post office address shown by the records of the Corporation,
specifying the place of such redemption; provided, however, that the
Corporation's failure to give such notice shall in no way affect its obligation
to redeem the shares of Series A Preferred Stock as provided in this Section
A.4.  If on or before a Payment Date, the funds necessary for satisfaction of
the Redemption 

                                       4

 
Payment on such date shall have been deposited with an independent payment agent
so as to be, and continue to be, available for such redemption, then,
notwithstanding that any certificate for shares of Series A Preferred Stock to
be redeemed shall not have been surrendered for cancellation, from and after the
close of business on the Payment Date, the shares to be redeemed as of such
Payment Date shall no longer be deemed outstanding, any dividends thereof shall
cease to accrue, and all rights with respect to such shares shall forthwith
cease, except the conversion rights pursuant to Sections A.5 and A.6, and the
right of the holders thereof to receive, upon presentation of the certificate
representing shares so called for redemption, the Redemption Payment applicable
to such Series A Preferred Stock without interest thereon.

     (d) If the funds of the Corporation legally available for redemption of
Series A Preferred Stock on a Payment Date are insufficient to pay the
Redemption Payment then due and to redeem the number of outstanding Series A
Preferred Stock to be redeemed on such Payment Date, the Corporation shall
redeem such shares of Series A Preferred Stock ratably from the holders thereof
to the extent of any funds legally available for redemption of such Series A
Preferred Stock, according to the respective amounts which would be payable with
respect to the full number of Series A Preferred Stock to be redeemed from them
on such date, as if all such Series A Preferred Stock were redeemed in full.  At
any time thereafter when additional funds of the Corporation are legally
available for the redemption of Series A Preferred Stock, such funds will be
used to redeem the balance of such Series A Preferred Stock which would have
otherwise been redeemed on such Payment Date, or such portion thereof for which
funds are then available, on the basis set forth above.

     (e) Subsequent to the Redemption Commencement Date, until the full Series A
Base Liquidation Amount has been paid in cash for all outstanding shares of
Series A Preferred Stock: (A) no dividend whatsoever shall be paid or declared,
and no distribution shall be made, on any capital stock of the Corporation other
than shares of Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock or Series D Preferred Stock; and (B) no shares of capital stock
of the Corporation (other than the Series A Preferred Stock, Series B Preferred
Stock, Series C Preferred Stock or the Series D Preferred Stock) shall be
purchased, redeemed or acquired by the Corporation and no monies shall be paid
into or set aside or made available for a sinking fund for the purchase,
redemption or acquisition thereof.

     (f) Upon receipt of the applicable Redemption Payment by certified check or
wire transfer, each holder of shares of Series A Preferred Stock to be redeemed
shall surrender the certificate or certificates representing such shares to the
Corporation, duly assigned or endorsed for transfer (or accompanied by duly
executed stock powers relating thereto), or shall deliver an Affidavit of Loss
with respect to such certificates at the principal executive office or the
Corporation or the office of the transfer agent for the Series A Preferred Stock
or such office or offices in the continental United States of an agent for
redemption as may from time to time be designated by notice to the holders of
Series A Preferred Stock and each surrendered certificate shall be canceled and
retired.

     (g) No share or shares of Series A Preferred Stock acquired by the
Corporation by reason of redemption, purchase, conversion or otherwise shall be
reissued, and all such shares shall be canceled and retired.

                                       5

 
     (h) Notwithstanding anything in this Section A.4 to the contrary, the
Corporation shall not be permitted to effect any redemption of the Series A
Preferred Stock, and no holder thereof shall have any right to have his or her
shares of Series A Preferred Stock redeemed by the Corporation, if at that time
such redemption is not permitted by the terms and provisions of the Indenture or
any refinancing thereof.

5.   Optional Conversion.
     ------------------- 

     (a) Beginning on and at all times after the effective date of this Amended
and Restated Statement of Designation, Preferences, Rights and Limitations, the
holder of each single share of the outstanding Series A Preferred Stock of the
Corporation shall have the right to surrender the certificate or certificates
evidencing such share(s) and receive, in lieu and in conversion thereof for each
one (1) share of Series A Preferred Stock of the Corporation so surrendered, a
certificate evidencing (i) a number of shares of Class A Common Stock of the
Corporation equal to the quotient obtained by dividing $3.726708075 by the then
applicable Conversion Price, plus (ii) one (1) share of Series B Preferred Stock
of the Corporation.  The "Conversion Price" of the Series A Preferred Stock is
initially $3.726708075, subject to adjustment as provided in Section A.7(a)
hereof.  Fractional shares of Series A Preferred Stock may not be surrendered.
Except as provided in Section A.1.(b) hereof, accumulated but unpaid dividends
on the shares of Series A Preferred Stock converted shall be paid at the time of
conversion, and such dividends are not convertible into Class A Common Stock or
Series B Preferred Stock.

     (b) In the event the Corporation shall, at any time that any of the shares
of Series A Preferred Stock are outstanding, be consolidated with or merged into
any other corporation or corporations, or sell or lease all or substantially all
of its property and business as an entirety, then lawful provision shall be made
as part of the terms of such consolidation, merger, sale, or lease for the
holder of any shares of Series A Preferred Stock thereafter to receive in lieu
of such shares of Class A Common Stock and Series B Preferred Stock otherwise
issuable to him upon conversion of his shares of Series A Preferred Stock, but
at the Conversion Price which would otherwise be in effect at the time of
conversion as hereinbefore provided, the same kind and relative amount of
securities or assets as may be issuable, distributable, or payable upon such
consolidation, merger, sale or lease, with respect to shares of Class A Common
Stock of the Corporation.

     (c) The Corporation need not issue fractional shares in satisfaction of the
conversion privilege of the shares of Series A Preferred Stock but, in lieu of
fractional shares, the Corporation at its option may make a cash settlement in
respect thereof equal to the purchase price of such Series A Preferred Stock, as
adjusted in accordance with Section A.7(a), multiplied by such fractional share
amount, or may issue scrip certificates exchangeable together with other such
scrip certificates aggregating one or more full shares for certificates
representing such full share or shares.  Until the exchange thereof for
certificates representing full shares of Class A Common  Stock and Series B
Preferred Stock, the holder of any such scrip certificates shall not be entitled
to receive dividends thereon, to vote with respect thereto, or to have any other
rights by virtue thereof as a shareholder of the Corporation, except such
rights, if any, as the Board of Directors may in its discretion determine in the
event of dissolution of the Corporation.

                                       6

 
     (d) The right of conversion of any holder of Series A Preferred Stock shall
be exercisable only if he or she provides thirty (30) days prior written notice,
by certified or registered mail, addressed to the attention of the Secretary of
the Corporation at the principal office of the Corporation, of his or her
intention to surrender shares of Series A Preferred Stock for conversion.  Such
conversion notice shall state the number of shares of Series A Preferred Stock
to be converted.

     (e) As promptly as practicable after the surrender for conversion of any
Series A Preferred Stock and considering the requirements for and in conformity
with all applicable laws, including, but not limited to, the Securities Act of
1933, as amended, the Corporation shall deliver or cause to be delivered at the
principal office of the Corporation (or such other places as may be designated
by the Corporation) to or upon the written order of the holder of such Series A
Preferred Stock, certificates representing the shares of Class A Common Stock
and Series B Preferred Stock, issuable upon such conversion, issued in such name
or names as such holder may direct.  Shares of the Series A Preferred stock
shall be deemed to have been converted as of the close of business on the date
of the surrender of the Series A Preferred Stock for conversion and the rights
of the holders of such Series A Preferred Stock shall cease at such time, and
the person or persons in whose name or names the certificates for such surrender
are to be issued shall be treated for all purposes as having become the record
holder or holders of such Class A Common Stock and Series B Preferred Stock at
such time; provided, however, that if the surrender is on any date when the
stock transfer books of the Corporation shall be closed, the person or persons
in whose name or names the certificates for such shares are to be issued shall
be treated as the record holder or holders thereof for all purposes at the close
of business on the next succeeding day on which such stock transfer books are
open.

     (f) The issuance of certificates for shares of Class A Common Stock and
Series B Preferred Stock upon conversion of the Series A Preferred Stock shall
be made without charge for any tax in respect of such issuance.  However, if any
certificate is to be issued in a name other than that of the holder of record of
the Series A Preferred Stock so converted, the person or persons requesting the
issuance thereof shall pay to the Corporation the amount of any tax which may be
payable in respect of any transfer involved in such issuance, or shall establish
to the satisfaction of the Corporation that such tax has been paid or is not due
and payable.

6.   Automatic Conversion.
     -------------------- 

     (a) Each outstanding share of Series A Preferred Stock shall automatically
be converted into (i) a number of shares of Class A Common Stock equal to the
quotient obtained by dividing $3.726708075 by the then applicable Conversion
Price, plus (ii) one (1) share of Series B Preferred Stock, immediately upon the
first to occur of either of the following events (each, an "Automatic Conversion
Event"): (A) the authorization of such conversion, including without limitation
in an action by written consent in accordance with Section 607.0704, Florida
Statutes, as amended from time to time, by the holders of not less than two-
thirds (66%) of all of the then issued and outstanding shares of Series A
Preferred Stock, or (B) the consummation by the Corporation of a public offering
of its securities which offering shall (x) raise total gross proceeds to the
Corporation of greater than or equal to $20,000,000 and (y) have a per share
offering price (I) if such offering is consummated on or before June 30, 1998,
greater than or equal 

                                       7

 
to 150% of the then applicable Conversion Price, or (II) if such offering is
consummated after June 30, 1998, greater than or equal to 200% of the then
applicable Conversion Price (a "Qualified Public Offering").

     (b) On or after the date of an occurrence of an Automatic Conversion Event,
and in any event within ten (10) days after receipt of notice, by mail, postage
prepaid from the Corporation of the occurrence of such event, each holder of
record of shares of Series A Preferred Stock shall surrender such holder's
certificates evidencing such shares at the principal office of the Corporation
or at such other place as the Corporation shall designate, and shall thereupon
be entitled to receive certificates evidencing the number of shares of Class A
Common Stock and Series B Preferred Stock into which such shares of Series A
Preferred Stock are converted.  Notwithstanding any other provisions herein to
the contrary, on the date of the occurrence of an Automatic Conversion Event,
each holder of record of the shares of Series A Preferred Stock shall be deemed
to be the holder of record of the Class A Common Stock and Series B Preferred
Stock issuable upon such conversion and no shares of Series A Preferred Stock
shall be considered outstanding notwithstanding that the certificates
representing such shares of Series A Preferred Stock shall not have been
surrendered at the office of the Corporation, that notice from the Corporation
shall not have been received by any holder of record of shares of Series A
Preferred Stock, or that the certificates evidencing such shares of Class A
Common Stock and Series B Preferred Stock shall not then be actually delivered
to such holder; provided, however, that the Corporation shall not be obligated
to issue certificates evidencing the shares of Class A Common Stock and Series B
Preferred Stock issuable upon such conversion unless certificates evidencing
such shares of the Series A Preferred Stock being converted are either delivered
to the Corporation or its transfer agent, or the holder notifies the Corporation
or its transfer agent that such certificates have been lost, stolen or destroyed
and executes an agreement satisfactory to the Corporation to indemnify the
Corporation from any loss incurred by it in connection therewith.

7.   Provisions Relating to Automatic and Optional Conversions.
     --------------------------------------------------------- 

     (a) Adjustments to Conversion Price.
         ------------------------------- 

          (i) Subdivision, Combination or Reclassification of Class A Common
              --------------------------------------------------------------
              Stock.
              ----- 

               (A)  If the Corporation shall, while there are any shares of
                    Series A Preferred Stock issued and outstanding, effect a
                    subdivision of its shares of Common Stock into a greater
                    number of such shares or a combination of such shares into a
                    lesser number of shares, whether by forward or reverse stock
                    split, stock dividend (payable in shares of Common Stock) or
                    otherwise, the Conversion Price shall be proportionally
                    increased or reduced, as the case may be, to reflect the
                    effectuation of such subdivision or combination.

               (B)  If the Corporation shall, while there are any shares of
                    Series A Preferred Stock issued and outstanding, effect a
                    capital reorganization or 

                                       8

 
                    reclassification of the Common Stock or any distribution by
                    the Corporation to holders of Class A Common Stock, whether
                    in the form of stock, debt securities, or other assets or
                    property of the Corporation, (each, an "Adjustment Event"),
                    then, as a condition of such Adjustment Event, lawful and
                    adequate provision shall be made whereby the holders of the
                    Series A Preferred Stock shall thereafter have the right to
                    acquire and receive upon conversion of the Series A
                    Preferred Stock such shares of stock, securities, assets or
                    property as would have been issuable or payable as a result
                    of such Adjustment Event with respect to or in exchange for
                    such number of outstanding shares of the Class A Common
                    Stock as would have been received as if such Series A
                    Preferred Stock were converted immediately prior to the
                    consummation of such Adjustment Event.

               (C)  In the event that an Adjustment Event shall occur by means
                    of a merger, consolidation, combination, share exchange, or
                    sale or lease of all or substantially all the assets of the
                    Corporation, then as a condition of such Adjustment Event,
                    lawful and adequate provision shall be made whereby the
                    holders of the Series A Preferred Stock shall thereafter
                    have the rights to acquire and receive upon conversion of
                    their shares of Series A Preferred Stock, such shares of
                    stock, securities or assets as would have been issuable or
                    payable as part of such Adjustment Event with respect to or
                    in exchange for such number of outstanding shares of the
                    Class A Common Stock as would have been received upon
                    conversion of the Series A Preferred Stock (in all
                    instances) immediately before such Adjustment Event, and in
                    any such case appropriate provisions shall be made with
                    respect to the rights and interests of the holders of the
                    Series A Preferred Stock such that the provisions hereof
                    (including without limitation provisions for adjustments of
                    the Conversion Price and of the number of shares of Class A
                    Common Stock acquirable and receivable upon the conversion
                    of the Series A Preferred Stock) shall thereafter be
                    applicable, in relation to any shares of stock, securities
                    or assets thereafter deliverable upon the conversion of the
                    Series A Preferred Stock (including an immediate adjustment,
                    by reason of such Adjustment Event of the Series A Preferred
                    Stock to the value for the Class A Common Stock reflected by
                    the terms of such Adjustment Event if the value so reflected
                    is less than the Conversion Price in effect immediately
                    prior to such Adjustment Event). In the event of an
                    Adjustment Event as a result of which a number of shares of
                    Common Stock of the surviving or purchasing corporation is
                    greater or lesser than the number of shares of Common Stock
                    of the Corporation outstanding immediately prior to such
                    Adjustment Event, then the Conversion Price in effect
                    immediately prior to such Adjustment Event shall be adjusted
                    in the same manner as though there were a subdivision or
                    combination of the 

                                       9

 
                    outstanding shares of Class A Common Stock of the
                    Corporation. The Corporation will not effect any such
                    Adjustment Event unless prior to the consummation thereof
                    the successor corporation (if other than the Corporation)
                    resulting from such consolidation or merger or the purchase
                    or lease of such assets shall assume by written instrument
                    mailed or delivered to the holders of the Series A Preferred
                    Stock at the last address of each such holder appearing on
                    the books of the Corporation, the obligation to deliver to
                    each such holder such shares of stock, securities or assets
                    as, in accordance with the foregoing provisions, such holder
                    may be entitled.

          (ii) Issuance of Common Stock.  Except as provided in Sections
               ------------------------                                 
               A.7(a)(iii) and A.7(a)(iv), if and whenever the Corporation shall
               issue or sell, or shall in accordance with subparagraphs (A)
               through (F), inclusive, of Section A.7(a)(iii) be deemed to have
               issued or sold, any shares of its Class A Common Stock, or
               options, warrants or other rights to purchase Class A Common
               Stock or securities convertible into Class A Common Stock, for a
               consideration per share less than the Conversion Price in effect
               immediately prior to the time of such issuance or sale, then
               forthwith upon such issuance or sale, the Conversion Price shall,
               subject to subparagraphs (A) to (F) of Section A.7(a)(iii), be
               reduced to:

               (A) For issuances or sales on or before 18 months after the date
                   of the first issuance of Series A Preferred Stock, the
                   Conversion Price shall equal such issuance or sale price.

               (B) For issuances or sales after 18 months from the date of the
                   first issuance of Series A Preferred Stock, the Conversion
                   Price shall be determined by multiplying the Conversion Price
                   in effect immediately prior to such issuance or sale by a
                   fraction; the numerator of which shall be (1) the number of
                   shares of Class A Common Stock outstanding immediately prior
                   to the issuance of such additional shares of Class A Common
                   Stock, plus (2) the number of shares of Class A Common Stock
                   which the net aggregate consideration, if any, received by
                   the Corporation for the total number of such additional
                   shares of Class A Common Stock so issued would purchase at
                   the Conversion Price in effect immediately prior to such
                   issuance, and; the denominator of which shall be (1) the
                   number of shares of Class A Common Stock outstanding
                   immediately prior to the issuance of such additional shares
                   of Class A Common Stock plus (2) the number of such
                   additional shares of Class A Common Stock so issued.

                                       10

 
          (iii)    For purposes of determining the adjusted Conversion Price
                   under Section A.7(a)(ii)(A) and (B), the following
                   subsections (A) to (F), inclusive, shall be applicable:

                   (A) Issuance of Rights or Options. Except as provided Section
                       ------------------------------
                       A.7(a)(iv), in case at any time the Corporation shall in
                       any manner grant (whether directly or by assumption in a
                       merger or otherwise) any rights to subscribe for or to
                       purchase, or any options for the purchase of, Class A
                       Common Stock or any stock or other securities convertible
                       into or exchangeable for Class A Common Stock (such
                       rights or options being herein called "Options" and such
                       convertible or exchangeable stock or securities being
                       herein called "Convertible Securities") whether or not
                       such Options or the right to convert or exchange any such
                       Convertible Securities are immediately exercisable, and
                       the price per share for which such Class A Common Stock
                       is issuable upon the exercise of such Options or upon
                       conversion or exchange of such Convertible Securities
                       (determined by dividing (x) the total amount, if any,
                       received or receivable by the Corporation as
                       consideration for the granting of such Options, plus the
                       minimum aggregate amount of additional consideration
                       payable to the Corporation upon the exercise of all such
                       Options, plus, in the case of such Options which relate
                       to Convertible Securities, the minimum aggregate amount
                       of additional consideration, if any, payable upon the
                       issue or sale of such Convertible Securities and upon the
                       conversion or exchange thereof, by (y) the total maximum
                       number of shares of Class A Common Stock issuable upon
                       the exercise of such Options) shall be less than the
                       Conversion Price in effect immediately prior to the time
                       of the granting of such Option, then the total maximum
                       number of shares of Class A Common Stock issuable upon
                       the exercise of such Options or upon conversion or
                       exchange of the total maximum amount of such Convertible
                       Securities issuable upon the exercise of such Options
                       shall (as of the date of granting of such Options) be
                       deemed to be outstanding and to have been issued by the
                       Corporation for such price per share. No adjustment of
                       the Conversion Price shall be made upon the actual
                       issuance of such Convertible Securities except as
                       otherwise provided in subsection (C) below.

                   (B) Issuance of Convertible Securities. In case the
                       ----------------------------------  
                       Corporation shall in any manner issue (whether directly
                       or by assumption in a merger or otherwise) or sell any
                       Convertible Securities, whether or not the rights to
                       exchange or convert thereunder are immediately
                       exercisable, and the price per share for which such Class
                       A Common Stock is issuable upon such conversion or
                       exchange (determined by dividing (x) the total amount
                       received or receivable by the Corporation as
                       consideration for the issuance or sale of 

                                       11

 
                       such Convertible Securities, plus the minimum aggregate
                       amount of additional consideration, if any, payable to
                       the Corporation upon the conversion or exchange thereof,
                       by (y) the total maximum number of shares of Class A
                       Common Stock issuable upon the conversion or exchange of
                       all such Convertible Securities) shall be less than the
                       Conversion Price in effect immediately prior to the time
                       of such issuance or sale, then the total maximum number
                       of all such Convertible Securities shall (as of the date
                       of the issue or sale of such Convertible Securities) be
                       deemed to be outstanding and to have been issued and sold
                       by the Corporation for such price per share, provided
                       that, except as otherwise specified in subsection (C)
                       below, no adjustment of the Conversion Price shall be
                       made upon the actual issue of such Class A Common Stock
                       upon exercise of any Options for which adjustments of the
                       Conversion Price have been or are to be made pursuant to
                       other provisions of this Section A.7(a) and no further
                       adjustment of the Conversion Price shall be made by
                       reason of such issuance or sale.

                   (C) Change in Option Price or Conversion Rate. If the
                       -----------------------------------------
                       purchase price provided for in any Option referred to in
                       subparagraph (A), the additional consideration, if any,
                       payable upon the conversion or exchange of any
                       Convertible Securities referred to in subparagraphs (A)
                       or (B), or the rate at which any Convertible Securities
                       referred to in subparagraphs (A) or (B) are convertible
                       into or exchangeable for Class A Common Stock, shall
                       change at any time (other than under or by reason of
                       provisions designed to protect against dilution of the
                       type set forth in Section A.7(a)), the Conversion Price
                       in effect at the time of such change shall forthwith be
                       readjusted to the Conversion Price which would have been
                       in effect at such time had such Options or Convertible
                       Securities still outstanding provided for such changed
                       purchase price, additional consideration, or conversion
                       rate, as the case may be, at the time initially granted,
                       issued or sold. If the purchase price provided for in any
                       Option referred to in subsection (A), or the rate at
                       which any Convertible Securities referred to in
                       subparagraphs (A) or (B) are convertible into or
                       exchangeable for Class A Common Stock, shall be reduced
                       at any time under or by reason or provisions with respect
                       thereto designed to protect against dilution, then in
                       case of the delivery of Class A Common Stock upon the
                       exercise of any such Option or upon conversion or
                       exchange of any such Convertible Security, the Conversion
                       Price then in effect hereunder shall forthwith be
                       adjusted to such respective amount as would have been
                       obtained had such Option or Convertible Security never
                       been issued as to such Class A Common Stock and had
                       adjustments been made upon the issuance of the shares of
                       Class A Common 

                                       12

 
                       Stock delivered as aforesaid, but only if as a result of
                       such adjustment the Conversion Price then in effect
                       hereunder is hereby reduced.

                   (D) Treatment of Expired Options and Unexercised Convertible
                       --------------------------------------------------------
                       Securities. On the expiration of any Option or the
                       ----------
                       termination of any right to convert or exchange any
                       Convertible Securities, the Conversion Price then in
                       effect hereunder shall forthwith be increased to the
                       Conversion Price which would have been in effect at the
                       time of such expiration or termination had such Option or
                       Convertible Securities, to the extent outstanding
                       immediately prior to such expiration or termination,
                       never been issued.

                   (E) Integral Transaction. In case any Options shall be issued
                       --------------------
                       in connection with the issue or sale of other securities
                       of the Corporation, together comprising one integral
                       transaction in which no specific consideration is
                       allocated to such Options by the parties thereto, such
                       Options shall be deemed to have been issued without
                       consideration.

                   (F) Consideration for Stock.  In case any shares of Class A
                       -----------------------                                
                       Common Stock, Options or Convertible Securities shall be
                       issued or sold or deemed to have been issued or sold for
                       cash, the consideration received therefor shall be deemed
                       to be the amount received by the Corporation therefor. In
                       case any shares of Class A Common Stock, Options, or
                       Convertible Securities shall be issued or sold for a
                       consideration other than cash, the amount of the
                       consideration other than cash received by the Corporation
                       shall be the fair value of such consideration. In case
                       any shares of Class A Common Stock, Options, or
                       Convertible Securities shall be issued in connection with
                       any merger in which the Corporation is the surviving
                       corporation, the amount of consideration therefor shall
                       be deemed to be the fair value of such portion of the net
                       assets and business of the non-surviving corporation as
                       shall be attributable to such Class A Common Stock,
                       Options, or Convertible Securities, as the case may be.
                       In the event of any consolidation or merger of the
                       Corporation in which the Corporation is not the surviving
                       corporation, or, in the event of any sale of all or
                       substantially all of the assets of the Corporation for
                       stock or other securities of any corporation, this
                       subsection shall be applied in the same manner as if the
                       Corporation had been the surviving corporation in such
                       consolidation or merger, or the purchasing corporation in
                       such sale of assets; and for purposes of this sentence
                       the Corporation shall be deemed:

                       (1) to have issued and sold a number of shares of its
                           Class A Common Stock, Options, or Convertible
                           Securities equal to the sum of (x) the number of
                           shares of the Corporation's Class A Common Stock

                                       13

 
                           actually outstanding, (y) the number of shares of the
                           Corporation's Class A Common Stock acquirable upon
                           the exercise of all outstanding Options, and (z) the
                           number of shares of the Corporation's Class A Common
                           Stock acquirable upon conversion of all outstanding
                           Convertible Securities, which those persons who were
                           security holders of the surviving corporation
                           immediately before the consummation of the
                           transaction would have received in exchange for the
                           common stock, options, and convertible securities of
                           the surviving corporation held by them immediately
                           after consummation of the transaction, based on the
                           exchange ratio on which the transaction was
                           consummated (i.e., the inverse of the ratio pursuant
                           to which the Corporation's Class A Common Stock were
                           exchangeable into the surviving corporation's
                           securities) and assuming that Corporation had been
                           the surviving corporation; and

                       (2) to have received in exchange therefor a consideration
                           equal to the fair market value (immediately before
                           the consummation of such transaction) of the assets
                           (less the liabilities) of the surviving corporation;
                           and if the application of this sentence results in
                           adjustment of the Conversion Price and number of
                           Conversion Shares issuable upon conversion of the
                           Series A Preferred Stock, then the determination of
                           the Conversion Price and the number of Conversion
                           Shares issuable upon conversion of the Series A
                           Preferred Stock immediately prior to such merger,
                           consolidation, or sale shall be made after giving
                           effect to the adjustment set forth herein. If the
                           stock of the surviving or purchasing corporation in
                           such a transaction is publicly traded, the market
                           value of such corporation's outstanding stock
                           immediately before consummation of the exchange shall
                           be presumptive evidence of the fair market value of
                           its assets (less liabilities).

               (iv) Notwithstanding anything in Section A.7 to the contrary, no
                    adjustment shall be made to the Conversion Price upon (w)
                    the issuance of any shares of Class A Common Stock, options
                    or Convertible Securities in connection with an acquisition
                    by the Corporation or a merger in which the Corporation is
                    the surviving corporation, calculated on a fully diluted
                    basis and further provided such issuance is to the sellers
                    of the acquired entity or assets or security of the merged
                    entity and is made for fair value and the Board of Directors
                    of the Corporation determines that the acquisition or merger
                    is in the best interests of the Corporation and its
                    stockholders; (x) the issuance of any shares of Class A
                    Common Stock upon conversion of any shares of Series A
                    Preferred Stock; (y) the issuance of Class A Common Stock
                    upon 

                                       14

 
                    the exercise of any options, warrants or other rights to
                    purchase Class A Common Stock outstanding on the date of the
                    first issuance of Series A Preferred Stock, including the
                    warrant to be issued to Alex. Brown & Sons Incorporated in
                    connection with the initial sale of Series A Preferred Stock
                    or (z) the future issuance of Class A Common Stock or
                    warrants, options or rights to purchase such Class A Common
                    Stock to employees, consultants, directors or vendors
                    directly or pursuant to plans approved by the Board of
                    Directors so long as such options are granted at fair market
                    value.

     (b) The Corporation shall at all times reserve and keep available out of
its authorized but unissued shares of Class A Common Stock solely for the
purpose of effecting the conversion of the shares of Series A Preferred Stock
pursuant to Sections A.5 and A.6 hereof, such number of its shares of Class A
Common Stock and Series B Preferred Stock as shall from time to time be
sufficient to effect such conversion of all outstanding shares of the Series A
Preferred Stock; and, if at any time the number of authorized but unissued
shares of Class A Common Stock or Series B Preferred Stock shall not be
sufficient to effect the conversion of all of the then outstanding shares of
Series A Preferred Stock, the Corporation will take such corporate action as
may, in the opinion of its counsel be necessary to increase its authorized but
unissued shares of Class A Common Stock or Series B Preferred Stock to such
number of shares as shall be sufficient for such purposes.

8.   Preemptive Rights.
     ----------------- 

     (a) At any time after the first closing of the sale of the Series A
Preferred Stock but prior to the filing of effective registration statement
relating to a Qualified Public Offering, or from time to time prior thereto, if
the Corporation shall issue, grant or sell any of its equity securities, the
Corporation shall, in each such case, offer a pro rata share of any such
issuance, grant or sale to the holders of Series A Preferred Stock and Series C
Preferred Stock.  If any holders of Series A Preferred Stock or Series C
Preferred Stock determine not to accept their pro rata share, then the other
Series A Preferred Stock holders and Series C Preferred Stockholders shall be
given the right to accept such share on a pro rata basis.

     (b) Notwithstanding the foregoing, the preemptive rights set forth in
Section A.8(a) shall not apply in the event of any issue, grant or sale in
connection with (i) a merger, consolidation, combination, share exchange or sale
or lease of all or substantially all assets of the Corporation or another
corporation; (ii) conversion of Series A Preferred Stock pursuant to Sections
A.5 or A.6 hereof; (iii) the exercise of options, warrants or other rights to
purchase stock outstanding prior to the issuance of any Series A Preferred
Stock; (iv) any stock option or other employee benefit plans of the Corporation
and (v) the grant or exercise of a warrant to purchase Class A Common Stock
issued to Alex. Brown & Sons Incorporated in connection with the initial sale of
Series A Preferred Stock.  In any event, all preemptive rights shall expire and
be of no further force and effect upon the effectiveness of a registration
statement relating to a Qualified Public Offering.

9.   No Impairment of Rights.
     ----------------------- 

                                       15

 
     Other than pursuant to the provisions of Section E hereunder, the
Corporation will not, by amendment of the Articles of Incorporation or through
any reorganization, transfer of assets, consolidation, merger, dissolution,
issue or sale of securities or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms of the Series A
Preferred Stock set forth herein, and will at all times in good faith assist  in
the carrying out of all such terms and in the taking of all such actions as may
be necessary or appropriate in order to protect the rights of the holders of the
Series A Preferred Stock against dilution or other impairment.  Without limiting
the generality of the foregoing, other than pursuant to the provisions of
Section E hereunder, the Corporation (i) will not increase the par value of any
shares of stock receivable on the conversion of the Series A Preferred Stock
above the amount payable therefore on such conversion, and (ii) will take all
such action as may be necessary or appropriate in order that the Corporation may
validly and legally issue fully paid and non-assessable shares of stock on the
conversion of all Series A Preferred Stock under the terms hereof from time to
time outstanding.

                   B.  4% SERIES B REDEEMABLE PREFERRED STOCK
                       --------------------------------------

1.   Dividends.
     --------- 

     (a) The holders of outstanding shares of Series B Preferred Stock shall be
entitled, in preference to the holders of any and all other classes of capital
stock of the Corporation (other than the Series A Preferred Stock, Series C
Preferred Stock, and Series D Preferred Stock, which will rank equally with the
Series B Preferred Stock as to dividends), to receive, out of any funds legally
available therefore, cumulative dividends on the Series B Preferred Stock in
cash, at the rate per annum of four percent (4%) of the Series B Base
Liquidation Amount (as defined in Section B.2 below), subject to proration for
partial years on the basis of a 365-day year ("Series B Cumulative Preference
Dividends").  Such dividends will accumulate commencing as of the date of
issuance of the Series B Preferred Stock and will be cumulative, to the extent
unpaid, whether or not they have been declared and whether or not there are
profits, surplus or other funds of the Corporation legally available for the
payment of dividends.  Series B Cumulative Preference Dividends shall become due
and payable with respect to any share of Series B Preferred Stock as provided in
Section B.2 and Section B.4.  Dividends paid in cash in an amount less than the
total amount of such dividends at the time accumulated and payable on all
outstanding shares of Series B Preferred Stock, including fractions, shall be
allocated pro rata on a share-by-share basis among all such shares at the time
outstanding.  At any time when shares of Series B Preferred Stock are
outstanding and the Series B Cumulative Preference Dividends have not been paid
in full in cash: (i) no dividend whatsoever shall be paid or declared, and no
distribution shall be made, on any capital stock of the Corporation ranking
junior to the Series B Preferred Stock; and no shares of capital stock of the
Corporation ranking junior to the Series B Preferred Stock shall be purchased,
redeemed or acquired by the Corporation and no monies shall be paid into or set
aside or made available for a sinking fund for the purchase, redemption or
acquisition thereof.  All numbers relating to the calculation of dividends
pursuant to this Section B.1 shall be subject to equitable adjustment in the
event of any stock split, combination, reorganization, recapitalization,
reclassification or other similar event involving a change in the Series B
Preferred Stock. At the time of the fifth anniversary following the initial sale
of the Series A Preferred Stock, the dividend on the Series B Preferred Stock
shall increase to 8% of the Series B Base Liquidation Amount per annum. 

                                       16

 
At the time of the sixth anniversary following the initial sale of the Series A
Preferred Stock, the dividend rate on the Series B Preferred Stock shall
increase to 14% of the Series B Base Liquidation Amount per annum.

     (b) Notwithstanding the foregoing, while any of the Senior Notes remain
outstanding, the Corporation shall not be permitted to pay any cash dividends
upon the Series B Preferred Stock (including any such dividends payable in
connection with a conversion of the Series B Preferred Stock) and the holders of
the Series B Preferred Stock shall not be entitled to receive any such
dividends, if and to the extent that such dividends would be prohibited by any
term or provision of the Indenture or any documents relating to any refinancing
of the Senior Notes; provided that the covenant under the caption "Restricted
                     --------                                                
Payments" in the Indenture, or any documents relating to any refinancing of the
Senior Notes, will not be materially more restrictive with regard to payments
than the restrictions set forth in the covenant under the caption "Certain
Covenants--Restricted Payments" in the Referenced Document, and provided further
                                                                ----------------
that no such amendment, supplement or modification of the Indenture, or any
documents relating to any refinancing of the Senior Notes, shall (i) increase
the aggregate principal amount of Senior Notes outstanding, (ii) be materially
more restrictive with regard to payments than the restrictions set forth in the
covenant under the caption "Certain Covenants--Restricted Payments" in the
Referenced Document or (iii) extend the maturity of the Senior Notes.  Any
change that will prohibit a payment that would otherwise be permitted pursuant
to the Referenced Document will be deemed material.

2.   Liquidation Preferences.
     ----------------------- 

     (a) Upon any Event of Dissolution, each holder of an outstanding share of
Series B Preferred Stock shall be entitled to be paid out of the assets of the
Corporation available for distribution to stockholders, whether such assets are
capital, surplus, or earnings as follows, and before any amount shall be paid or
distributed to the holders of  Class A Common Stock or Class B Common Stock or
of any other stock ranking on liquidation junior to the Series B Preferred Stock
(other than the Series A Preferred Stock, the Series C Preferred Stock, and the
Series D Preferred Stock, which will rank equally with the Series B Preferred
Stock in an Event of Dissolution) an amount in cash equal to the sum of (a)
$3.726708075 per share (adjusted appropriately for stock splits, stock
dividends, recapitalizations and the like with respect to the Series B Preferred
Stock), plus (b) any accumulated but unpaid dividends to which such holder of
outstanding shares of Series B Preferred Stock is entitled pursuant to Section
B.1 hereof (the sum of (a) and (b) being referred to as the "Series B Base
Liquidation Amount"); provided, however, that if, upon any Event of Dissolution,
                      --------  -------                                         
the amounts payable with respect to the Series B Preferred Stock are not paid in
full, the holders of the Series B Preferred Stock shall share ratably in any
distribution of assets in proportion to the full respective preferential amounts
to which they are entitled.

     (b) After full payment shall have been made to the holders of shares of the
Series B Preferred Stock (and Series A Preferred Stock, Series C Preferred Stock
and Series D Preferred Stock in accordance with Sections A.2, C.2 and D.2), any
balance of the assets of the Corporation then remaining shall be allocated to
the holders of shares of other classes of stock ranking junior to the Series B
Preferred Stock, 

                                       17

 
including the holders of Class A Common Stock and Class B Common Stock, in
accordance with the respective interests therein.

3.   Voting Rights.
     ------------- 

     The holders of Series B Preferred Stock shall not be entitled to vote on
any matters except those contemplated by Section E and to the extent otherwise
required under the FBCA.

4.   Redemption.
     ---------- 

     (a)  The Corporation shall redeem the Series B Preferred Stock as follows:

          (i)    The Corporation shall, upon consummation of a Qualified Public
                 Offering, to the extent it may do so under applicable law and
                 to the extent it may do so under Section B.4(a)(ii), redeem all
                 of the outstanding shares of Series B Preferred Stock at a
                 price equal to the Series B Base Liquidation Amount as of the
                 date of such consummation. For redemptions required under this
                 Section B.4(a)(i), the "Payment Date" shall be the date of
                 consummation of a Qualified Public Offering, and the
                 "Redemption Payment" shall be the aggregate Series B Base
                 Liquidation Amount.

          (ii)   The managing underwriter of the Qualified Public Offering shall
                 have the right to limit the redemption of all or any part of
                 the Series B Preferred Stock then outstanding. In such event,
                 the part of the Series B Preferred Stock not redeemed shall
                 automatically convert into a three year obligation (the
                 "Obligation") payable to the holder thereof in the principal
                 amount of the Series B Base Liquidation Amount. Principal and
                 interest on each Obligation shall be payable quarterly, with
                 interest at the rate of 2% over the Prime Rate during the first
                 year, 4% over the Prime Rate during the second year, and 6%
                 over the Prime Rate during the third year after issuance.
                 "Prime Rate" shall mean the prime rate reported from time to
                 time in The Wall Street Journal, initially on the date the
                         -----------------------
                 Series B Preferred Stock converts into the Obligation, and each
                 anniversary thereafter. In the event that any quarterly payment
                 on the Obligations is not paid when due, the interest rate
                 applicable over the remaining life of the Obligations shall be
                 increased to 6% over the Prime Rate.

          (iii)  Commencing on the fifth anniversary of the initial sale of the
                 Series A Preferred Stock, the Corporation shall, to the extent
                 it may do so under applicable law, redeem all of the
                 outstanding shares of Series B Preferred Stock at a price equal
                 to the Series B Base Liquidation Amount at the time of
                 redemption.

                                       18

 
     (b) Any redemption under Section B.4(a)(iii) shall occur in two payments,
the first to occur on the Redemption Commencement Date and the second to occur
one (1) year thereafter (each a "Payment Date").  Each payment (a "Redemption
Payment") shall be in an amount equal to one-half of the Series B Base
Liquidation Amount calculated as of the date of such payment, with the final
Redemption Payment in an amount necessary to fully redeem all remaining
outstanding Series B Preferred Stock at a price equal to the Series B Base
Liquidation Amount.

     (c) On each Payment Date, the Corporation shall redeem shares of Series B
Preferred Stock ratably from the holders thereof to the extent of the Redemption
Payment due on such date, according to the respective amounts which would be
payable with respect to the full number of Series B Preferred Stock to be
redeemed from them on such date, as if all such Series B Preferred Stock were
redeemed in full.  The Redemption Payment shall be payable in cash in
immediately available funds on the Payment Date.  Any outstanding shares of
Series B Preferred Stock not redeemed shall remain outstanding.  All shares of
Series B Preferred Stock which are to be redeemed hereunder shall remain issued
and outstanding until the Redemption Price therefor has been indefeasibly paid
in full in cash or has been deposited with an independent payment agent pursuant
to Section B.4(d).

     (d) On or before the Redemption Commencement Date, the Corporation will
give written notice by mail, postage prepaid to the holders of record of Series
B Preferred Stock to be redeemed under Section B.4(a), such notice to be
addressed to each such holder at its post office address shown by the records of
the Corporation, specifying the place of such redemption; provided, however,
that the Corporation's failure to give such notice shall in no way affect its
obligation to redeem the shares of Series B Preferred Stock as provided in this
B.4.  If on or before a Payment Date, the funds necessary for satisfaction of
the Redemption Payment under Section B.4(a) on such date shall have been
deposited with an independent payment agent so as to be, and continue to be,
available for such redemption, then, notwithstanding that any certificate for
shares of Series B Preferred Stock to be redeemed shall not have been
surrendered for cancellation, from and after the close of business on the
Payment Date, the shares to be redeemed as of such Payment Date shall no longer
be deemed outstanding, any dividends thereof shall cease to accrue, and all
rights with respect to such shares shall forthwith cease, except the right of
the holders thereof to receive, upon presentation of the certificate
representing shares so called for redemption, the Redemption Payment applicable
to such Series B Preferred Stock without interest thereon.

     (e) If the funds of the Corporation legally available for redemption of
Series B Preferred Stock on the Payment Date are insufficient to pay the
Redemption Payment then due and to redeem the number of outstanding Series B
Preferred Stock to be redeemed on such Payment Date, the Corporation shall
redeem such shares of Series B Preferred Stock ratably from the holders thereof
to the extent of any funds legally available for redemption of such Series B
Preferred Stock, according to the respective amounts which would be payable with
respect to the full number of Series B Preferred Stock to be redeemed from them
on such date, as if all such Series B Preferred Stock were redeemed in full.  At
any time thereafter when additional funds of the Corporation are legally
available for the redemption of Series B Preferred Stock, such funds will be
used to redeem the balance of such Series B Preferred Stock, which would have

                                       19

 
otherwise been redeemed on such Payment Date, or such portion thereof for which
funds are then available, on the basis set forth above.

     (f) Subsequent to the Redemption Commencement Date, until the full Series B
Base Liquidation Amount has been paid in cash for all outstanding shares of
Series B Preferred Stock: (A) no dividend whatsoever shall be paid or declared,
and no distribution shall be made, on any capital stock of the Corporation other
than shares of Series A Preferred Stock, Series B Preferred Stock Series C
Preferred Stock or Series D Preferred Stock; and (B) no shares of capital stock
of the Corporation (other than the Series A Preferred Stock or the Series B
Preferred Stock, the Series C Preferred Stock or the Series D Preferred Stock)
shall be purchased, redeemed or acquired by the Corporation and no monies shall
be paid into or set aside or made available for a sinking fund for the purchase,
redemption or acquisition thereof.

     (g) Upon receipt of the applicable Redemption Payment by certified check or
wire transfer, each holder of shares of Series B Preferred Stock to be redeemed
shall surrender the certificate or certificates representing such shares to the
Corporation, duly assigned or endorsed for transfer (or accompanied by duly
executed stock powers relating thereto), or shall deliver an Affidavit of Loss
with respect to such certificates at the principal executive office or the
Corporation or the office of the transfer agent for the Series B Preferred Stock
or such office or offices in the continental United States of an agent for
redemption as may from time to time be designated by notice to the holders of
Series B Preferred Stock and each surrendered certificate shall be canceled and
retired.

     (h) No share or shares of Series B Preferred Stock acquired by the
Corporation by reason of redemption, purchase, conversion or otherwise shall be
reissued, and all such shares shall be canceled and retired.

     (i) Notwithstanding anything in this Section B.4. to the contrary, the
Corporation shall not be permitted to effect any redemption of the Series B
Preferred Stock, and no holder thereof shall have any right to have his or her
shares of Series B Preferred Stock redeemed by the Corporation, if at that time
such redemption is not permitted by the terms and provisions of the Indenture or
any documents relating to any refinancing of the Senior Notes.  Any change that
will prohibit a payment that would otherwise be permitted pursuant to the
Referenced Document will be deemed material.

5.   No Impairment of Rights.
     ----------------------- 

     Other than pursuant to the provisions of Section E hereunder, the
Corporation will not, by amendment of the Articles of Incorporation or through
any reorganization, transfer of assets, consolidation, merger, dissolution,
issue or sale of securities or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms of the Series B
Preferred Stock set forth herein, and will at all times in good faith assist  in
the carrying out of all such terms and in the taking of all such actions as may
be necessary or appropriate in order to protect the rights of the holders of the
Series B Preferred Stock against dilution or other impairment.

                                       20

 
                  C.  4% SERIES C CONVERTIBLE PREFERRED STOCK
                  -------------------------------------------

1.   Dividends.
     --------- 

     (a) The holders of outstanding shares of Series C Preferred Stock shall be
entitled, in preference to the holders of any and all other classes of capital
stock of the Corporation (other than the Series A Preferred Stock, the Series B
Preferred Stock, and the Series D Preferred Stock, which will rank equally with
the Series C Preferred Stock as to dividends), to receive, out of any funds
legally available therefore, cumulative dividends on the Series C Preferred
Stock in cash, at the rate per annum of four percent (4%) of the Series C Base
Liquidation Amount (as defined in Section C.2 below), subject to proration for
partial years on the basis of a 365-day year ("Series C Cumulative Preference
Dividends").  Such dividends will accumulate commencing as of the date of
issuance of the Series C Preferred Stock and will be cumulative, to the extent
unpaid, whether or not they have been declared and whether or not there are
profits, surplus or other funds of the Corporation legally available for the
payment of dividends.  Accrued but unpaid dividends on the Series C Preferred
Stock shall be payable upon  conversion of the Series C Preferred Stock into
Class A Common Stock and Series D Preferred Stock.  Dividends paid in cash in an
amount less than the total amount of such dividends at the time accumulated and
payable on all outstanding shares of Series C Preferred Stock, including
fractions, shall be allocated pro rata on a share-by-share basis among all such
shares at the time outstanding.  At any time when shares of Series C Preferred
Stock are outstanding and the Series C Cumulative Preference Dividends have not
been paid in full in cash: (i) no dividend whatsoever shall be paid or declared,
and no distribution shall be made, on any capital stock of the Corporation
ranking junior to the Series C Preferred Stock; and no shares of capital stock
of the Corporation ranking junior to the Series C Preferred Stock shall be
purchased, redeemed or acquired by the Corporation and no monies shall be paid
into or set aside or made available for a sinking fund for the purchase,
redemption or acquisition thereof.  All numbers relating to the calculation of
dividends pursuant to this Section C.1 shall be subject to equitable adjustment
in the event of any stock split, combination, reorganization, recapitalization,
reclassification or other similar event involving a change in the Series C
Preferred Stock.  At the time of the fifth anniversary following the initial
sale of the Series A Preferred Stock, the dividend rate on the Series C
Preferred Stock shall increase to 8% of the Series C Base Liquidation Amount per
annum.  On the sixth anniversary date, the dividend rate on the Series C
Preferred Stock shall increase to 14% of the Series C Base Liquidation Amount
per annum.

     (b) Notwithstanding the foregoing, while any of the Senior Notes remain
outstanding, the Corporation shall not be permitted to pay any cash dividends
upon the Series C Preferred Stock (including any such dividends payable in
connection with a conversion of the Series C Preferred Stock) and the holders of
the Series C Preferred Stock shall not be entitled to receive any such
dividends, if and to the extent that such dividends would be prohibited by any
term or provision of the Indenture or any documents relating to any refinancing
of the Senior Notes; provided that the covenant under the caption "Restricted
                     --------                                                
Payments" in the Indenture, or any documents relating to any refinancing of the
Senior Notes, will not be materially more restrictive with regard to payments
than the restrictions set forth in the covenant under the caption "Certain
Covenants--Restricted Payments" in the Referenced Document, and provided further
                                                                ----------------
that no such amendment, supplement or modification of the Indenture, or any
documents relating to any refinancing of the Senior Notes, shall (i) increase
the aggregate principal amount of Senior Notes outstanding, (ii) be materially
more restrictive with regard to payments than the restrictions set forth in the

                                       21

 
covenant under the caption "Certain Covenants--Restricted Payments" in the
Referenced Document or (iii) extend the maturity of the Senior Notes.  Any
change that will prohibit a payment that would otherwise be permitted pursuant
to the Referenced Document will be deemed material.

2.   Liquidation Preferences.
     ----------------------- 

     (a) In the event of any distribution of assets upon any voluntary or
involuntary liquidation, dissolution or winding up of the Corporation, including
by consolidation, merger, share exchange or sale of all or substantially all of
the assets of the Corporation (in each case, an "Event of Dissolution"), each
holder of outstanding shares of Series C Preferred Stock shall be entitled to be
paid out of the assets of the Corporation available for distribution to
stockholders, whether such assets are capital, surplus, or earnings, and before
any amount shall be paid or distributed to the holders of  Class A Common Stock
or Class B Common Stock or of any other stock ranking on liquidation junior to
the Series C Preferred Stock (other than the Series A Preferred Stock, the
Series B Preferred Stock, and the Series D Preferred Stock, which will rank
equally with the Series C Preferred Stock in an Event of Dissolution) an amount
in cash equal to the greater of (i) the sum of (a) $4.472 per share (adjusted
appropriately for stock splits, stock dividends, recapitalizations and the like
with respect to the Series C Preferred Stock), plus (b) any accumulated but
unpaid dividends to which such holder of outstanding shares of Series C
Preferred Stock is entitled pursuant to Section C.1 hereof (the sum of (a) and
(b) being referred to as the "Series C Base Liquidation Amount")  or (ii) the
amount per share of Series C Preferred Stock which the holders thereof would
have received if all such shares had been converted to Class A Common Stock and
Series D Preferred Stock pursuant to Sections C.5, C.6 or C.7 hereof immediately
prior to such Event of Dissolution, less any amount previously distributed on
such shares in connection with such Event of Dissolution; provided, however,
                                                          --------  ------- 
that if, upon any Event of Dissolution, the amounts payable with respect to the
Series C Preferred Stock are not paid in full, the holders of the Series C
Preferred Stock shall share ratably in any distribution of assets in proportion
to the full respective preferential amounts to which they are entitled.

     (b)  After full payment shall have been made to the holders of shares of
the Series C Preferred Stock (and Series A Preferred Stock, Series B Preferred
Stock and Series D Preferred Stock in accordance with Sections A.2, B.2 and D.2,
respectively), any balance of the assets of the Corporation then remaining shall
be allocated to the holders of shares of other classes of stock ranking junior
to the Series C Preferred Stock, including the holders of Class A Common Stock
and Class B Common Stock, in accordance with the respective interests therein.

                                       22

 
3.   Voting Rights.
     ------------- 

     (a) Except as otherwise expressly provided in these Amended and Restated
Articles of Incorporation, or as required by the FBCA, the holders of shares of
Series C Preferred Stock shall vote together with the holders of Class A Common
Stock, Class B Common Stock and Series A Preferred Stock as a single voting
group on all actions to be taken by the shareholders of the Corporation.  Each
share of Series C Preferred Stock shall entitle the holder thereof to such
number of votes per share on each such action as shall equal (i) the largest
number of whole shares of Class A Common Stock into which such shares of Series
C Preferred Stock could be converted, pursuant to the provisions of Sections
C.5, C.6 or C.7 hereof, multiplied by (ii) ten (10) at the record date for the
determination of shareholders entitled to vote on such matter or, if no such
record date is established, at the date such vote is taken or any written
consent of shareholders is solicited.

     (b) Except as expressly provided herein or as required by law, as long as
20% or more of the greatest number of shares of Series C Preferred Stock issued
remain outstanding, the Corporation shall not, without the approval by vote or
written consent of the holders of at least 66% of the outstanding shares of
Series C Preferred Stock; (i) authorize or issue any class or series of equity
securities having equal or superior rights to the Series C Preferred Stock as to
payment upon liquidation, dissolution or a winding up of the Corporation; (ii)
enter into any agreement that would restrict the Corporation's ability to
perform under any purchase agreement executed by the Corporation in connection
with an issuance of Series C Preferred Stock; (iii) amend its Articles of
Incorporation or Bylaws in any way which adversely affects the rights and
preferences of the holders of Series C Preferred Stock as a class; (iv) sell or
lease 20% or more of its assets, except in the ordinary course of business; (v)
issue additional securities to employees, officers or directors, except
securities issuable upon the exercise of options and warrants outstanding
immediately prior to the issuance of any Series C Preferred Stock, or issuable
upon the exercise of options granted in the future at fair market value; (vi)
issue any securities for a price less than fair market value, other than as may
be required by contractual commitments existing prior to the issuance of any
Series C Preferred Stock; or (vii) adopt any stock option plan other than the
Corporation's 1996 Stock Option Plan or increase the number of shares available
for issuance under such plan.

     (c) The holders of the Series C Preferred Stock and Series A Preferred
Stock, voting together as a single class, shall be entitled to elect two-fifths
(2/5) of the number of directors on the Board of Directors of the Corporation.

4.   Redemption.
     ---------- 

     (a) Commencing on the fifth anniversary of the initial sale of the Series A
Preferred Stock (the "Redemption Commencement Date"), the Corporation shall, to
the extent it may do so under applicable law, redeem all of the outstanding
shares of Series C Preferred Stock at a price equal to the Series C Base
Liquidation Amount at the time of redemption.  Such redemption shall occur in
two payments, the first to occur on the Redemption Commencement Date and the
second to occur one (1) year thereafter (each a "Payment Date").  Each payment
(a "Redemption Payment") shall be in an amount equal to one-half of the Series C
Base Liquidation Amount calculated as of the date of such payment, with the
final Redemption 

                                       23

 
Payment in an amount necessary to fully redeem all remaining outstanding Series
C Preferred Stock at a price equal to the Series C Base Liquidation Amount.

     (b) On each Payment Date, the Corporation shall redeem shares of Series C
Preferred Stock ratably from the holders thereof to the extent of the Redemption
Payment due on such date, according to the respective amounts which would be
payable with respect to the full number of Series C Preferred Stock to be
redeemed from them on such date, as if all such Series C Preferred Stock were
redeemed in full.  The Redemption Payment shall be payable in cash in
immediately available funds on the Payment Date.  Any outstanding shares of
Series C Preferred Stock not redeemed shall remain outstanding.  All shares of
Series C Preferred Stock which are to be redeemed hereunder shall remain issued
and outstanding until the Redemption Price therefor has been indefeasibly paid
in full in cash or has been deposited with an independent payment agent pursuant
to Section C.4(c).  Any Series C Preferred Stock which would otherwise be
redeemed on a Payment Date may be converted by the holder thereof to Class A
Common Stock and Series D Preferred Stock, in accordance with the provisions
hereof, at any time prior to the close of business on the last business day next
preceding such Payment Date.

     (c) On or before the Redemption Commencement Date, the Corporation will
give written notice by mail, postage prepaid to the holders of record of Series
A Preferred Stock to be redeemed, such notice to be addressed to each such
holder at its post office address shown by the records of the Corporation,
specifying the place of such redemption; provided, however, that the
Corporation's failure to give such notice shall in no way affect its obligation
to redeem the shares of Series C Preferred Stock as provided in this Section
C.4.  If on or before a Payment Date, the funds necessary for satisfaction of
the Redemption Payment on such date shall have been deposited with an
independent payment agent so as to be, and continue to be, available for such
redemption, then, notwithstanding that any certificate for shares of Series C
Preferred Stock to be redeemed shall not have been surrendered for cancellation,
from and after the close of business on the Payment Date, the shares to be
redeemed as of such Payment Date shall no longer be deemed outstanding, any
dividends thereof shall cease to accrue, and all rights with respect to such
shares shall forthwith cease, except the conversion rights pursuant to Sections
C.5 and C.6, and the right of the holders thereof to receive, upon presentation
of the certificate representing shares so called for redemption, the Redemption
Payment applicable to such Series C Preferred Stock without interest thereon.

     (d) If the funds of the Corporation legally available for redemption of
Series C Preferred Stock on a Payment Date are insufficient to pay the
Redemption Payment then due and to redeem the number of outstanding Series C
Preferred Stock to be redeemed on such Payment Date, the Corporation shall
redeem such shares of Series C Preferred Stock ratably from the holders thereof
to the extent of any funds legally available for redemption of such Series C
Preferred Stock, according to the respective amounts which would be payable with
respect to the full number of Series C Preferred Stock to be redeemed from them
on such date, as if all such Series C Preferred Stock were redeemed in full.  At
any time thereafter when additional funds of the Corporation are legally
available for the redemption of Series C Preferred Stock, such funds will be
used to redeem the balance of such Series C Preferred Stock which would have
otherwise been redeemed on such Payment Date, or such portion thereof for which
funds are then available, on the basis set forth above.

                                       24

 
     (e) Subsequent to the Redemption Commencement Date, until the full Series C
Base Liquidation Amount has been paid in cash for all outstanding shares of
Series C Preferred Stock: (A) no dividend whatsoever shall be paid or declared,
and no distribution shall be made, on any capital stock of the Corporation other
than shares of Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock or Series D Preferred Stock; and (B) no shares of capital stock
of the Corporation (other than the Series A Preferred Stock, Series B Preferred
Stock, Series C Preferred Stock or the Series D Preferred Stock) shall be
purchased, redeemed or acquired by the Corporation and no monies shall be paid
into or set aside or made available for a sinking fund for the purchase,
redemption or acquisition thereof.

     (f) Upon receipt of the applicable Redemption Payment by certified check or
wire transfer, each holder of shares of Series C Preferred Stock to be redeemed
shall surrender the certificate or certificates representing such shares to the
Corporation, duly assigned or endorsed for transfer (or accompanied by duly
executed stock powers relating thereto), or shall deliver an Affidavit of Loss
with respect to such certificates at the principal executive office or the
Corporation or the office of the transfer agent for the Series C Preferred Stock
or such office or offices in the continental United States of an agent for
redemption as may from time to time be designated by notice to the holders of
Series C Preferred Stock and each surrendered certificate shall be canceled and
retired.

     (g) No share or shares of Series C Preferred Stock acquired by the
Corporation by reason of redemption, purchase, conversion or otherwise shall be
reissued, and all such shares shall be canceled and retired.

     (h) Notwithstanding anything in this Section C.4. to the contrary, the
Corporation shall not be permitted to effect any redemption of the Series C
Preferred Stock, and no holder thereof shall have any right to have his or her
shares of Series C Preferred Stock redeemed by the Corporation, if at that time
such redemption is not permitted by the terms and provisions of the Indenture or
any refinancing thereof.

5.   Optional Conversion.
     ------------------- 

     (a) Beginning on and at all times after the effective date of this Amended
and Restated Statement of Designation, Preferences, Rights and Limitations, the
holder of each single share of the outstanding Series C Preferred Stock of the
Corporation shall have the right to surrender the certificate or certificates
evidencing such share(s) and receive, in lieu and in conversion thereof for each
one (1) share of Series C Preferred Stock of the Corporation so surrendered, a
certificate evidencing (i) a number of shares of Class A Common Stock of the
Corporation equal to the quotient obtained by dividing $4.472 by the then
applicable Conversion Price, plus (ii) one (1) share of Series D Preferred Stock
of the Corporation. The "Conversion Price" of the Series C Preferred Stock is
initially $4.472, subject to adjustment as provided in Section C.7(a) hereof.
Fractional shares of Series C Preferred Stock may not be surrendered. Except as
provided in Section C.1.(b) hereof, accumulated but unpaid dividends on the
shares of Series C Preferred Stock converted shall be paid at the time of
conversion, and such dividends are not convertible into Class A Common Stock or
Series D Preferred Stock.

     (b) In the event the Corporation shall, at any time that any of the shares
of Series C Preferred Stock are outstanding, be consolidated with or merged into
any other corporation or corporations, or sell 

                                       25

 
or lease all or substantially all of its property and business as an entirety,
then lawful provision shall be made as part of the terms of such consolidation,
merger, sale, or lease for the holder of any shares of Series C Preferred Stock
thereafter to receive in lieu of such shares of Class A Common Stock and Series
D Preferred Stock otherwise issuable to him upon conversion of his shares of
Series C Preferred Stock, but at the Conversion Price which would otherwise be
in effect at the time of conversion as hereinbefore provided, the same kind and
relative amount of securities or assets as may be issuable, distributable, or
payable upon such consolidation, merger, sale or lease, with respect to shares
of Class A Common Stock of the Corporation.

     (c) The Corporation need not issue fractional shares in satisfaction of the
conversion privilege of the shares of Series C Preferred Stock but, in lieu of
fractional shares, the Corporation at its option may make a cash settlement in
respect thereof equal to the purchase price of such Series C Preferred Stock, as
adjusted in accordance with Section C.7(a), multiplied by such fractional share
amount, or may issue scrip certificates exchangeable together with other such
scrip certificates aggregating one or more full shares for certificates
representing such full share or shares.  Until the exchange thereof for
certificates representing full shares of Class A Common  Stock and Series D
Preferred Stock, the holder of any such scrip certificates shall not be entitled
to receive dividends thereon, to vote with respect thereto, or to have any other
rights by virtue thereof as a shareholder of the Corporation, except such
rights, if any, as the Board of Directors may in its discretion determine in the
event of dissolution of the Corporation.

     (d) The right of conversion of any holder of Series C Preferred Stock shall
be exercisable only if he or she provides thirty (30) days prior written notice,
by certified or registered mail, addressed to the attention of the Secretary of
the Corporation at the principal office of the Corporation, of his or her
intention to surrender shares of Series C Preferred Stock for conversion.  Such
conversion notice shall state the number of shares of Series C Preferred Stock
to be converted.

     (e) As promptly as practicable after the surrender for conversion of any
Series C Preferred Stock and considering the requirements for and in conformity
with all applicable laws, including, but not limited to, the Securities Act of
1933, as amended, the Corporation shall deliver or cause to be delivered at the
principal office of the Corporation (or such other places as may be designated
by the Corporation) to or upon the written order of the holder of such Series C
Preferred Stock, certificates representing the shares of Class A Common Stock
and Series D Preferred Stock, issuable upon such conversion, issued in such name
or names as such holder may direct.  Shares of the Series C Preferred Stock
shall be deemed to have been converted as of the close of business on the date
of the surrender of the Series C Preferred Stock for conversion and the rights
of the holders of such Series C Preferred Stock shall cease at such time, and
the person or persons in whose name or names the certificates for such surrender
are to be issued shall be treated for all purposes as having become the record
holder or holders of such Class A Common Stock and Series D Preferred Stock at
such time; provided, however, that if the surrender is on any date when the
stock transfer books of the Corporation shall be closed, the person or persons
in whose name or names the certificates for such shares are to be issued shall
be treated as the record holder or holders thereof for all purposes at the close
of business on the next succeeding day on which such stock transfer books are
open.

                                       26

 
     (f) The issuance of certificates for shares of Class A Common Stock and
Series D Preferred Stock upon conversion of the Series C Preferred Stock shall
be made without charge for any tax in respect of such issuance.  However, if any
certificate is to be issued in a name other than that of the holder of record of
the Series C Preferred Stock so converted, the person or persons requesting the
issuance thereof shall pay to the Corporation the amount of any tax which may be
payable in respect of any transfer involved in such issuance, or shall establish
to the satisfaction of the Corporation that such tax has been paid or is not due
and payable.

6.   Automatic Conversion.
     -------------------- 

     (a) Each outstanding share of Series C Preferred Stock shall automatically
be converted into (i) a number of shares of Class A Common Stock equal to the
quotient obtained by dividing $4.472 by the then applicable Conversion Price,
plus (ii) one (1) share of Series D Preferred Stock, immediately upon the first
to occur of either of the following events (each, an "Automatic Conversion
Event"): (A) the authorization of such conversion, including without limitation
in an action by written consent in accordance with Section 607.0704, Florida
Statutes, as amended from time to time, by the holders of not less than two-
thirds (66%) of all of the then issued and outstanding shares of Series C
Preferred Stock, or (B) the consummation by the Corporation of a Qualified
Public Offering.

     (b) On or after the date of an occurrence of an Automatic Conversion Event,
and in any event within ten (10) days after receipt of notice, by mail, postage
prepaid from the Corporation of the occurrence of such event, each holder of
record of shares of Series C Preferred Stock shall surrender such holder's
certificates evidencing such shares at the principal office of the Corporation
or at such other place as the Corporation shall designate, and shall thereupon
be entitled to receive certificates evidencing the number of shares of Class A
Common Stock and Series D Preferred Stock into which such shares of Series A
Preferred Stock are converted.  Notwithstanding any other provisions herein to
the contrary, on the date of the occurrence of an Automatic Conversion Event,
each holder of record of the shares of Series C Preferred Stock shall be deemed
to be the holder of record of the Class A Common Stock and Series D Preferred
Stock issuable upon such conversion and no shares of Series C Preferred Stock
shall be considered outstanding notwithstanding that the certificates
representing such shares of Series C Preferred Stock shall not have been
surrendered at the office of the Corporation, that notice from the Corporation
shall not have been received by any holder of record of shares of Series C
Preferred Stock, or that the certificates evidencing such shares of Class A
Common Stock and Series D Preferred Stock shall not then be actually delivered
to such holder; provided, however, that the Corporation shall not be obligated
to issue certificates evidencing the shares of Class A Common Stock and Series D
Preferred Stock issuable upon such conversion unless certificates evidencing
such shares of the Series C Preferred Stock being converted are either delivered
to the Corporation or its transfer agent, or the holder notifies the Corporation
or its transfer agent that such certificates have been lost, stolen or destroyed
and executes an agreement satisfactory to the Corporation to indemnify the
Corporation from any loss incurred by it in connection therewith.
 
7.   Provisions Relating to Automatic and Optional Conversions.
     --------------------------------------------------------- 

     (a) Adjustments to Conversion Price.
         ------------------------------- 

                                       27

 
          (i)  Subdivision, Combination or Reclassification of Class A Common
               --------------------------------------------------------------
               Stock.
               ----- 

               (A)  If the Corporation shall, while there are any shares of
                    Series C Preferred Stock issued and outstanding, effect a
                    subdivision of its shares of Common Stock into a greater
                    number of such shares or a combination of such shares into a
                    lesser number of shares, whether by forward or reverse stock
                    split, stock dividend (payable in shares of Common Stock) or
                    otherwise, the Conversion Price shall be proportionally
                    increased or reduced, as the case may be, to reflect the
                    effectuation of such subdivision or combination.

               (B)  If the Corporation shall, while there are any shares of
                    Series C Preferred Stock issued and outstanding, effect a
                    capital reorganization or reclassification of the Common
                    Stock or any distribution by the Corporation to holders of
                    Class A Common Stock, whether in the form of stock, debt
                    securities, or other assets or property of the Corporation,
                    (each, an "Adjustment Event"), then, as a condition of such
                    Adjustment Event, lawful and adequate provision shall be
                    made whereby the holders of the Series C Preferred Stock
                    shall thereafter have the right to acquire and receive upon
                    conversion of the Series C Preferred Stock such shares of
                    stock, securities, assets or property as would have been
                    issuable or payable as a result of such Adjustment Event
                    with respect to or in exchange for such number of
                    outstanding shares of the Class A Common Stock as would have
                    been received as if such Series C Preferred Stock were
                    converted  immediately prior to the consummation of such
                    Adjustment Event.

               (C)  In the event that an Adjustment Event shall occur by means
                    of a merger, consolidation, combination, share exchange, or
                    sale or lease of all or substantially all the assets of the
                    Corporation, then as a condition of such Adjustment Event,
                    lawful and adequate provision shall be made whereby the
                    holders of the Series C Preferred Stock shall thereafter
                    have the rights to acquire and receive upon conversion of
                    their shares of Series C Preferred Stock, such shares of
                    stock, securities or assets as would have been issuable or
                    payable as part of such Adjustment Event with respect to or
                    in exchange for such number of outstanding shares of the
                    Class A Common Stock as would have been received upon
                    conversion of the 

                                       28

 
                    Series C Preferred Stock (including an immediate adjustment,
                    by reason of such Adjustment Event of the Series C Preferred
                    Stock to the value for the Class A Common Stock reflected by
                    the terms of such Adjustment Event if the value so reflected
                    is less than the Conversion Price in effect immediately
                    prior to such Adjustment Event). In the event of an
                    Adjustment Event as a result of which a number of shares of
                    Common Stock of the surviving or purchasing corporation is
                    greater or lesser than the number of shares of Common Stock
                    of the Corporation outstanding immediately prior to such
                    Adjustment Event, then the Conversion Price in effect
                    immediately prior to such Adjustment Event shall be adjusted
                    in the same manner as though there were a subdivision or
                    combination of the outstanding shares of Class A Common
                    Stock of the Corporation. The Corporation will not effect
                    any such Adjustment Event unless prior to the consummation
                    thereof the successor corporation (if other than the
                    Corporation) resulting from such consolidation or merger or
                    the purchase or lease of such assets shall assume by written
                    instrument mailed or delivered to the holders of the Series
                    C Preferred Stock at the last address of each such holder
                    appearing on the books of the Corporation, the obligation to
                    deliver to each such holder such shares of stock, securities
                    or assets as, in accordance with the foregoing provisions,
                    such holder may be entitled.

          (ii) Issuance of Common Stock.  Except as provided in Sections
               ------------------------                                 
               C.7(a)(iii) and C.7(a)(iv), if and whenever the Corporation shall
               issue or sell, or shall in accordance with subparagraphs (A)
               through (F), inclusive, of Section C.7(a)(iii) be deemed to have
               issued or sold, any shares of its Class A Common Stock, or
               options, warrants or other rights to purchase Class A Common
               Stock or securities convertible into Class A Common Stock, for a
               consideration per share less than the Conversion Price in effect
               immediately prior to the time of such issuance or sale, then
               forthwith upon such issuance or sale, the Conversion Price shall,
               subject to subparagraphs (A) to (F) of Section C.7(a)(iii), be
               reduced to:

               (A) For issuances or sales on or before 18 months after the date
                   of the first issuance of Series A Preferred Stock, the
                   Conversion Price shall equal such issuance or sale price.

               (B) For issuances or sales after 18 months from the date of the
                   first issuance of Series A Preferred Stock, the Conversion
                   Price shall be determined by multiplying the Conversion Price
                   in effect immediately prior to such issuance or sale by a
                   fraction; the numerator of which shall be (1) the number of
                   shares of Class A Common Stock outstanding immediately prior
                   to the issuance of such additional shares of Class A Common
                   Stock, plus (2) the number of shares of Class A Common Stock
                   which the net aggregate consideration, if any, received by
                   the Corporation for the total number of 

                                       29

 
                   such additional shares of Class A Common Stock so issued
                   would purchase at the Conversion Price in effect immediately
                   prior to such issuance, and; the denominator of which shall
                   be (1) the number of shares of Class A Common Stock
                   outstanding immediately prior to the issuance of such
                   additional shares of Class A Common Stock plus (2) the number
                   of such additional shares of Class A Common Stock so issued.

     (iii)     For purposes of determining the adjusted Conversion Price under
               Section C.7(a)(ii)(A) and (B), the following subsections (A) to
               (F), inclusive, shall be applicable:

               (A) Issuance of Rights or Options.  Except as provided Section
                   -----------------------------                             
                   C.7(a)(iv), in case at any time the Corporation shall in any
                   manner grant (whether directly or by assumption in a merger
                   or otherwise) any rights to subscribe for or to purchase, or
                   any options for the purchase of, Class A Common Stock or any
                   stock or other securities convertible into or exchangeable
                   for Class A Common Stock (such rights or options being herein
                   called "Options" and such convertible or exchangeable stock
                   or securities being herein called "Convertible Securities")
                   whether or not such Options or the right to convert or
                   exchange any such Convertible Securities are immediately
                   exercisable, and the price per share for which such Class A
                   Common Stock is issuable upon the exercise of such Options or
                   upon conversion or exchange of such Convertible Securities
                   (determined by dividing (x) the total amount, if any,
                   received or receivable by the Corporation as consideration
                   for the granting of such Options, plus the minimum aggregate
                   amount of additional consideration payable to the Corporation
                   upon the exercise of all such Options, plus, in the case of
                   such Options which relate to Convertible Securities, the
                   minimum aggregate amount of additional consideration, if any,
                   payable upon the issue or sale of such Convertible Securities
                   and upon the conversion or exchange thereof, by (y) the total
                   maximum number of shares of Class A Common Stock issuable
                   upon the exercise of such Options) shall be less than the
                   Conversion Price in effect immediately prior to the time of
                   the granting of such Option, then the total maximum number of
                   shares of Class A Common Stock issuable upon the exercise of
                   such Options or upon conversion or exchange of the total
                   maximum amount of such Convertible Securities issuable upon
                   the exercise of such Options shall (as of the date of
                   granting of such Options) be deemed to be outstanding and to
                   have been issued by the Corporation for such price per share.
                   No adjustment of the Conversion Price shall be made upon the
                   actual issuance of such Convertible Securities except as
                   otherwise provided in subsection (C) below.

               (B) Issuance of Convertible Securities.  In case the Corporation
                   ----------------------------------                          
                   shall in any manner issue (whether directly or by assumption
                   in a merger or otherwise) 

                                       30

 
                   or sell any Convertible Securities, whether or not the rights
                   to exchange or convert thereunder are immediately
                   exercisable, and the price per share for which such Class A
                   Common Stock is issuable upon such conversion or exchange
                   (determined by dividing (x) the total amount received or
                   receivable by the Corporation as consideration for the
                   issuance or sale of such Convertible Securities, plus the
                   minimum aggregate amount of additional consideration, if any,
                   payable to the Corporation upon the conversion or exchange
                   thereof, by (y) the total maximum number of shares of Class A
                   Common Stock issuable upon the conversion or exchange of all
                   such Convertible Securities) shall be less than the
                   Conversion Price in effect immediately prior to the time of
                   such issuance or sale, then the total maximum number of all
                   such Convertible Securities shall (as of the date of the
                   issue or sale of such Convertible Securities) be deemed to be
                   outstanding and to have been issued and sold by the
                   Corporation for such price per share, provided that, except
                   as otherwise specified in subsection (C) below, no adjustment
                   of the Conversion Price shall be made upon the actual issue
                   of such Class A Common Stock upon exercise of any Options for
                   which adjustments of the Conversion Price have been or are to
                   be made pursuant to other provisions of this Section C.7(a)
                   and no further adjustment of the Conversion Price shall be
                   made by reason of such issuance or sale.

               (C) Change in Option Price or Conversion Rate.  If the purchase
                   -----------------------------------------                  
                   price provided for in any Option referred to in subparagraph
                   (A), the additional consideration, if any, payable upon the
                   conversion or exchange of any Convertible Securities referred
                   to in subparagraphs (A) or (B), or the rate at which any
                   Convertible Securities referred to in subparagraphs (A) or
                   (B) are convertible into or exchangeable for Class A Common
                   Stock, shall change at any time (other than under or by
                   reason of provisions designed to protect against dilution of
                   the type set forth in Section C.7(a)), the Conversion Price
                   in effect at the time of such change shall forthwith be
                   readjusted to the Conversion Price which would have been in
                   effect at such time had such Options or Convertible
                   Securities still outstanding provided for such changed
                   purchase price, additional consideration, or conversion rate,
                   as the case may be, at the time initially granted, issued or
                   sold. If the purchase price provided for in any Option
                   referred to in subsection (A), or the rate at which any
                   Convertible Securities referred to in subparagraphs (A) or
                   (B) are convertible into or exchangeable for Class A Common
                   Stock, shall be reduced at any time under or by reason or
                   provisions with respect thereto designed to protect against
                   dilution, then in case of the delivery of Class A Common
                   Stock upon the exercise of any such Option or upon conversion
                   or exchange of any such Convertible Security, the Conversion
                   Price then in effect hereunder shall forthwith be adjusted to
                   such respective amount as would have been obtained had such
                   Option or Convertible Security never been issued as to such
                   Class A Common Stock and had 

                                       31

 
                   adjustments been made upon the issuance of the shares of
                   Class A Common Stock delivered as aforesaid, but only if as a
                   result of such adjustment the Conversion Price then in effect
                   hereunder is hereby reduced.

               (D) Treatment of Expired Options and Unexercised Convertible
                   --------------------------------------------------------
                   Securities. On the expiration of any Option or the
                   ----------  
                   termination of any right to convert or exchange any
                   Convertible Securities, the Conversion Price then in effect
                   hereunder shall forthwith be increased to the Conversion
                   Price which would have been in effect at the time of such
                   expiration or termination had such Option or Convertible
                   Securities, to the extent outstanding immediately prior to
                   such expiration or termination, never been issued.

               (E) Integral Transaction.  In case any Options shall be issued in
                   --------------------                                         
                   connection with the issue or sale of other securities of the
                   Corporation, together comprising one integral transaction in
                   which no specific consideration is allocated to such Options
                   by the parties thereto, such Options shall be deemed to have
                   been issued without consideration.

               (F) Consideration for Stock.  In case any shares of Class A
                   -----------------------                                
                   Common Stock, Options or Convertible Securities shall be
                   issued or sold or deemed to have been issued or sold for
                   cash, the consideration received therefor shall be deemed to
                   be the amount received by the Corporation therefor. In case
                   any shares of Class A Common Stock, Options, or Convertible
                   Securities shall be issued or sold for a consideration other
                   than cash, the amount of the consideration other than cash
                   received by the Corporation shall be the fair value of such
                   consideration. In case any shares of Class A Common Stock,
                   Options, or Convertible Securities shall be issued in
                   connection with any merger in which the Corporation is the
                   surviving corporation, the amount of consideration therefor
                   shall be deemed to be the fair value of such portion of the
                   net assets and business of the non-surviving corporation as
                   shall be attributable to such Class A Common Stock, Options,
                   or Convertible Securities, as the case may be. In the event
                   of any consolidation or merger of the Corporation in which
                   the Corporation is not the surviving corporation, or, in the
                   event of any sale of all or substantially all of the assets
                   of the Corporation for stock or other securities of any
                   corporation, this subsection shall be applied in the same
                   manner as if the Corporation had been the surviving
                   corporation in such consolidation or merger, or the
                   purchasing corporation in such sale of assets; and for
                   purposes of this sentence the Corporation shall be deemed:

                   (1) to have issued and sold a number of shares of its Class A
                       Common Stock, Options, or Convertible Securities equal to
                       the sum of (x) the number of shares of the Corporation's
                       Class A Common Stock actually outstanding, (y) the number
                       of shares of the Corporation's 

                                       32

 
                       Class A Common Stock acquirable upon the exercise of all
                       outstanding Options, and (z) the number of shares of the
                       Corporation's Class A Common Stock acquirable upon
                       conversion of all outstanding Convertible Securities,
                       which those persons who were security holders of the
                       surviving corporation immediately before the consummation
                       of the transaction would have received in exchange for
                       the common stock, options, and convertible securities of
                       the surviving corporation held by them immediately after
                       consummation of the transaction, based on the exchange
                       ratio on which the transaction was consummated (i.e., the
                       inverse of the ratio pursuant to which the Corporation's
                       Class A Common Stock were exchangeable into the surviving
                       corporation's securities) and assuming that Corporation
                       had been the surviving corporation; and

               (2)     to have received in exchange therefor a consideration
                       equal to the fair market value (immediately before the
                       consummation of such transaction) of the assets (less the
                       liabilities) of the surviving corporation; and if the
                       application of this sentence results in adjustment of the
                       Conversion Price and number of Conversion Shares issuable
                       upon conversion of the Series C Preferred Stock, then the
                       determination of the Conversion Price and the number of
                       Conversion Shares issuable upon conversion of the Series
                       C Preferred Stock immediately prior to such merger,
                       consolidation, or sale shall be made after giving effect
                       to the adjustment set forth herein. If the stock of the
                       surviving or purchasing corporation in such a transaction
                       is publicly traded, the market value of such
                       corporation's outstanding stock immediately before
                       consummation of the exchange shall be presumptive
                       evidence of the fair market value of its assets (less
                       liabilities).

           (iv)   Notwithstanding anything in Section C.7 to the contrary, no
                  adjustment shall be made to the Conversion Price upon (w) the
                  issuance of any shares of Class A Common Stock, options or
                  Convertible Securities in connection with an acquisition by
                  the Corporation or a merger in which the Corporation is the
                  surviving corporation, calculated on a fully diluted basis and
                  further provided such issuance is to the sellers of the
                  acquired entity or assets or security of the merged entity and
                  is made for fair value and the Board of Directors of the
                  Corporation determines that the acquisition or merger is in
                  the best interests of the Corporation and its stockholders;
                  (x) the issuance of any shares of Class A Common Stock upon
                  conversion of any shares of Series C Preferred Stock; (y) the
                  issuance of Class A Common Stock upon the exercise of any
                  options, warrants or other rights to purchase Class A Common
                  Stock outstanding on the date of the first issuance of Series
                  A Preferred Stock, including the warrant to be issued to Alex.
                  Brown & Sons 

                                       33

 
                  Incorporated in connection with the initial sale of Series A
                  Preferred Stock or (z) the future issuance of Class A Common
                  Stock or warrants, options or rights to purchase such Class A
                  Common Stock to employees, consultants, directors or vendors
                  directly or pursuant to plans approved by the Board of
                  Directors so long as such options are granted at fair market
                  value.

     (b) The Corporation shall at all times reserve and keep available out of
its authorized but unissued shares of Class A Common Stock solely for the
purpose of effecting the conversion of the shares of Series C Preferred Stock
pursuant to Sections C.5 and C.6 hereof, such number of its shares of Class A
Common Stock and Series D Preferred Stock as shall from time to time be
sufficient to effect such conversion of all outstanding shares of the Series C
Preferred Stock; and, if at any time the number of authorized but unissued
shares of Class A Common Stock or Series D Preferred Stock shall not be
sufficient to effect the conversion of all of the then outstanding shares of
Series C Preferred Stock, the Corporation will take such corporate action as
may, in the opinion of its counsel be necessary to increase its authorized but
unissued shares of Class A Common Stock or Series D Preferred Stock to such
number of shares as shall be sufficient for such purposes.

8.   Preemptive Rights.
     ----------------- 

     (a) At any time after the first closing of the sale of the Series A
Preferred Stock but prior to the filing of effective registration statement
relating to a Qualified Public Offering, or from time to time prior thereto, if
the Corporation shall issue, grant or sell any of its equity securities, the
Corporation shall, in each such case, offer a pro rata share of any such
issuance, grant or sale to the holders of Series A Preferred Stock and Series C
Preferred Stock.  If any holders of Series A Preferred Stock or Series C
Preferred Stock determine not to accept their pro rata share, then the other
Series A Preferred Stock holders and Series C Preferred Stockholders shall be
given the right to accept such share on a pro rata basis.

     (b) Notwithstanding the foregoing, the preemptive rights set forth in
Section C.8(a) shall not apply in the event of any issue, grant or sale in
connection with (i) a merger, consolidation, combination, share exchange or sale
or lease of all or substantially all assets of the Corporation or another
corporation; (ii) conversion of Series C Preferred Stock pursuant to Sections
C.5 or C.6 hereof; (iii) the exercise of options, warrants or other rights to
purchase stock outstanding prior to the issuance of any Series C Preferred
Stock; (iv) any stock option or other employee benefit plans of the Corporation
and (v) the grant or exercise of a warrant to purchase Class A Common Stock
issued to Alex. Brown & Sons Incorporated in connection with the initial sale of
Series A Preferred Stock.  In any event, all preemptive rights shall expire and
be of no further force and effect upon the effectiveness of a registration
statement relating to a Qualified Public Offering.

9.   No Impairment of Rights.
     ----------------------- 

     Other than pursuant to the provisions of Section E hereunder, the
Corporation will not, by amendment of the Articles of Incorporation or through
any reorganization, transfer of assets, consolidation, merger, dissolution,
issue or sale of securities or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms of the Series C
Preferred Stock set forth herein, and will 

                                       34

 
at all times in good faith assist in the carrying out of all such terms and in
the taking of all such actions as may be necessary or appropriate in order to
protect the rights of the holders of the Series C Preferred Stock against
dilution or other impairment. Without limiting the generality of the foregoing,
other than pursuant to the provisions of Section E hereunder, the Corporation
(i) will not increase the par value of any shares of stock receivable on the
conversion of the Series C Preferred Stock above the amount payable therefore on
such conversion, and (ii) will take all such action as may be necessary or
appropriate in order that the Corporation may validly and legally issue fully
paid and non-assessable shares of stock on the conversion of all Series C
Preferred Stock under the terms hereof from time to time outstanding.

10.  Issuance of Series C Preferred Stock.
     ------------------------------------ 

     The Series C Preferred Stock shall only be issued in connection with the
consummation of the Series A Convertible Preferred Stock Purchase Agreement
dated as of March 6, 1997, among the Corporation and the Purchasers named
therein.

                   D.  4% SERIES D REDEEMABLE PREFERRED STOCK
                       --------------------------------------

1.   Dividends.
     --------- 

     (a) The holders of outstanding shares of Series D Preferred Stock shall be
entitled, in preference to the holders of any and all other classes of capital
stock of the Corporation (other than the Series A Preferred Stock, Series B
Preferred Stock, and Series C Preferred Stock, which will rank equally with the
Series D Preferred Stock as to dividends), to receive, out of any funds legally
available therefore, cumulative dividends on the Series D Preferred Stock in
cash, at the rate per annum of four percent (4%) of the Series D Base
Liquidation Amount (as defined in Section D.2 below), subject to proration for
partial years on the basis of a 365-day year ("Series D Cumulative Preference
Dividends").  Such dividends will accumulate commencing as of the date of
issuance of the Series D Preferred Stock and will be cumulative, to the extent
unpaid, whether or not they have been declared and whether or not there are
profits, surplus or other funds of the Corporation legally available for the
payment of dividends.  Series D Cumulative Preference Dividends shall become due
and payable with respect to any share of Series D Preferred Stock as provided in
Section D.2 and Section D.4.  Dividends paid in cash in an amount less than the
total amount of such dividends at the time accumulated and payable on all
outstanding shares of Series D Preferred Stock, including fractions, shall be
allocated pro rata on a share-by-share basis among all such shares at the time
outstanding.  At any time when shares of Series D Preferred Stock are
outstanding and the Series D Cumulative Preference Dividends have not been paid
in full in cash: (i) no dividend whatsoever shall be paid or declared, and no
distribution shall be made, on any capital stock of the Corporation ranking
junior to the Series D Preferred Stock; and no shares of capital stock of the
Corporation ranking junior to the Series D Preferred Stock shall be purchased,
redeemed or acquired by the Corporation and no monies shall be paid into or set
aside or made available for a sinking fund for the purchase, redemption or
acquisition thereof.  All numbers relating to the calculation of dividends
pursuant to this Section D.1 shall be subject to equitable adjustment in the
event of any stock split, combination, reorganization, recapitalization,
reclassification or other similar event involving a change in the Series D
Preferred Stock.  At the time of the fifth anniversary following the initial
sale of the Series A Preferred Stock, the dividend on the Series D Preferred
Stock shall increase to 8% of the Series D Base Liquidation 

                                       35

 
Amount per annum. At the time of the sixth anniversary following the initial
sale of the Series A Preferred Stock, the dividend rate on the Series D
Preferred Stock shall increase to 14% of the Series D Base Liquidation Amount
per annum.

     (b) Notwithstanding the foregoing, while any of the Senior Notes remain
outstanding, the Corporation shall not be permitted to pay any cash dividends
upon the Series D Preferred Stock (including any such dividends payable in
connection with a conversion of the Series D Preferred Stock) and the holders of
the Series D Preferred Stock shall not be entitled to receive any such
dividends, if and to the extent that such dividends would be prohibited by any
term or provision of Indenture or any documents relating to any refinancing of
the Senior Notes; provided that the covenant under the caption "Restricted
                  --------                                                
Payments" in the Indenture, or any documents relating to any refinancing of the
Senior Notes, will not be materially more restrictive with regard to payments
than the restrictions set forth in the covenant under the caption "Certain
Covenants--Restricted Payments" in the Referenced Document, and provided further
                                                                ----------------
that no such amendment, supplement or modification of the Indenture, or any
documents relating to any refinancing of the Senior Notes, shall (i) increase
the aggregate principal amount of Senior Notes outstanding, (ii) be materially
more restrictive with regard to payments than the restrictions set forth in the
covenant under the caption "Certain Covenants--Restricted Payments" in the
Referenced Document or (iii) extend the maturity of the Senior Notes.  Any
change that will prohibit a payment that would otherwise be permitted pursuant
to the Referenced Document will be deemed material.

2.   Liquidation Preferences.
     ----------------------- 

     (a) Upon any Event of Dissolution, each holder of an outstanding share of
Series D Preferred Stock shall be entitled to be paid out of the assets of the
Corporation available for distribution to stockholders, whether such assets are
capital, surplus, or earnings as follows, and before any amount shall be paid or
distributed to the holders of  Class A Common Stock or Class B Common Stock or
of any other stock ranking on liquidation junior to the Series D Preferred Stock
(other than the Series A Preferred Stock, the Series B Preferred Stock, and the
Series C Preferred Stock, which will rank equally with the Series D Preferred
Stock in an Event of Dissolution) an amount in cash equal to the sum of (a)
$4.472  per share (adjusted appropriately for stock splits, stock dividends,
recapitalizations and the like with respect to the Series D Preferred Stock),
plus (b) any accumulated but unpaid dividends to which such holder of
outstanding shares of Series D Preferred Stock is entitled pursuant to Section
D.1 hereof (the sum of (a) and (b) being referred to as the "Series D Base
Liquidation Amount"); provided, however, that if, upon any Event of Dissolution,
                      --------  -------                                         
the amounts payable with respect to the Series D Preferred Stock are not paid in
full, the holders of the Series D Preferred Stock shall share ratably in any
distribution of assets in proportion to the full respective preferential amounts
to which they are entitled.

     (b) After full payment shall have been made to the holders of shares of the
Series D Preferred Stock (and Series A Preferred Stock, Series B Preferred Stock
and Series C Preferred Stock in accordance with Sections A.2, B.2 and C.2), any
balance of the assets of the Corporation then remaining shall be allocated to
the holders of shares of other classes of stock ranking junior to the Series D
Preferred Stock, including the holders of Class A Common Stock and Class B
Common Stock, in accordance with the respective interests therein.

                                       36

 
3.   Voting Rights.
     ------------- 

     The holders of Series D Preferred Stock shall not be entitled to vote on
any matters except those contemplated by Section E and to the extent otherwise
required under the FBCA.

4.   Redemption.
     ---------- 

     (a)  The Corporation shall redeem the Series D Preferred Stock as follows:

          (i)   The Corporation shall, upon consummation of a Qualified Public
                Offering, to the extent it may do so under applicable law and to
                the extent it may do so under Section D.4(a)(ii), redeem all of
                the outstanding shares of Series D Preferred Stock at a price
                equal to the Series D Base Liquidation Amount as of the date of
                such consummation. For redemptions required under this Section
                D.4(a)(i), the "Payment Date" shall be the date of consummation
                of a Qualified Public Offering, and the "Redemption Payment"
                shall be the aggregate Series D Base Liquidation Amount.

          (ii)  The managing underwriter of the Qualified Public Offering shall
                have the right to limit the redemption of all or any part of the
                Series D Preferred Stock then outstanding. In such event, the
                part of the Series D Preferred Stock not redeemed shall
                automatically convert into a three year obligation (the
                "Obligation") payable to the holder thereof in the principal
                amount of the Series D Base Liquidation Amount. Principal and
                interest on each Obligation shall be payable quarterly, with
                interest at the rate of 2% over the Prime Rate during the first
                year, 4% over the Prime Rate during the second year, and 6% over
                the Prime Rate during the third year after issuance. "Prime
                Rate" shall mean the prime rate reported from time to time in
                The Wall Street Journal, initially on the date the Series B
                -----------------------
                Preferred Stock converts into the Obligation, and each
                anniversary thereafter. In the event that any quarterly payment
                on the Obligations is not paid when due, the interest rate
                applicable over the remaining life of the Obligations shall be
                increased to 6% over the Prime Rate.

          (iii) Commencing on the fifth anniversary of the initial sale of the
                Series A Preferred Stock, the Corporation shall, to the extent
                it may do so under applicable law, redeem all of the outstanding
                shares of Series D Preferred Stock at a price equal to the
                Series D Base Liquidation Amount at the time of redemption.

     (b)  Any redemption under Section D.4(a)(iii) shall occur in two payments,
the first to occur on the Redemption Commencement Date and the second to occur
one (1) year thereafter (each a "Payment Date"). Each payment (a "Redemption
Payment") shall be in an amount equal to one-half of the Series D Base
Liquidation Amount calculated as of the date of such payment, with the final
Redemption Payment in an amount necessary to fully redeem all remaining
outstanding Series D Preferred Stock at a price equal to the Series D Base
Liquidation Amount.

                                       37

 
     (c)  On each Payment Date, the Corporation shall redeem shares of Series D
Preferred Stock ratably from the holders thereof to the extent of the Redemption
Payment due on such date, according to the respective amounts which would be
payable with respect to the full number of Series D Preferred Stock to be
redeemed from them on such date, as if all such Series D Preferred Stock were
redeemed in full.  The Redemption Payment shall be payable in cash in
immediately available funds on the Payment Date.  Any outstanding shares of
Series D Preferred Stock not redeemed shall remain outstanding.  All shares of
Series D Preferred Stock which are to be redeemed hereunder shall remain issued
and outstanding until the Redemption Price therefor has been indefeasibly paid
in full in cash or has been deposited with an independent payment agent pursuant
to Section D.4(d).

     (d)  On or before the Redemption Commencement Date, the Corporation will
give written notice by mail, postage prepaid to the holders of record of Series
D Preferred Stock to be redeemed under Section D.4(a), such notice to be
addressed to each such holder at its post office address shown by the records of
the Corporation, specifying the place of such redemption; provided, however,
that the Corporation's failure to give such notice shall in no way affect its
obligation to redeem the shares of Series D Preferred Stock as provided in this
Section D.4.  If on or before a Payment Date, the funds necessary for
satisfaction of the Redemption Payment under Section D.4(a) on such date shall
have been deposited with an independent payment agent so as to be, and continue
to be, available for such redemption, then, notwithstanding that any certificate
for shares of Series D Preferred Stock to be redeemed shall not have been
surrendered for cancellation, from and after the close of business on the
Payment Date, the shares to be redeemed as of such Payment Date shall no longer
be deemed outstanding, any dividends thereof shall cease to accrue, and all
rights with respect to such shares shall forthwith cease, except the right of
the holders thereof to receive, upon presentation of the certificate
representing shares so called for redemption, the Redemption Payment applicable
to such Series D Preferred Stock without interest thereon.

     (e)  If the funds of the Corporation legally available for redemption of
Series D Preferred Stock on the Payment Date are insufficient to pay the
Redemption Payment then due and to redeem the number of outstanding Series D
Preferred Stock to be redeemed on such Payment Date, the Corporation shall
redeem such shares of Series D Preferred Stock ratably from the holders thereof
to the extent of any funds legally available for redemption of such Series D
Preferred Stock, according to the respective amounts which would be payable with
respect to the full number of Series D Preferred Stock to be redeemed from them
on such date, as if all such Series D Preferred Stock were redeemed in full.  At
any time thereafter when additional funds of the Corporation are legally
available for the redemption of Series D Preferred Stock, such funds will be
used to redeem the balance of such Series D Preferred Stock, which would have
otherwise been redeemed on such Payment Date, or such portion thereof for which
funds are then available, on the basis set forth above.

     (f)  Subsequent to the Redemption Commencement Date, until the full Series
D Base Liquidation Amount has been paid in cash for all outstanding shares of
Series B Preferred Stock: (A) no dividend whatsoever shall be paid or declared,
and no distribution shall be made, on any capital stock of the Corporation other
than shares of Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock, and Series D Preferred Stock; and (B) no shares of capital
stock of the Corporation (other than the Series A Preferred Stock, the Series B
Preferred Stock, the Series C Preferred Stock and the Series D 

                                       38

 
Preferred Stock) shall be purchased, redeemed or acquired by the Corporation and
no monies shall be paid into or set aside or made available for a sinking fund
for the purchase, redemption or acquisition thereof.

     (g)  Upon receipt of the applicable Redemption Payment by certified check
or wire transfer, each holder of shares of Series D Preferred Stock to be
redeemed shall surrender the certificate or certificates representing such
shares to the Corporation, duly assigned or endorsed for transfer (or
accompanied by duly executed stock powers relating thereto), or shall deliver an
Affidavit of Loss with respect to such certificates at the principal executive
office or the Corporation or the office of the transfer agent for the Series D
Preferred Stock or such office or offices in the continental United States of an
agent for redemption as may from time to time be designated by notice to the
holders of Series D Preferred Stock and each surrendered certificate shall be
canceled and retired.

                                       39

 
     (h) No share or shares of Series D Preferred Stock acquired by the
Corporation by reason of redemption, purchase, conversion or otherwise shall be
reissued, and all such shares shall be canceled and retired.

     (i) Notwithstanding anything in this Section D.4. to the contrary, the
Corporation shall not be permitted to effect any redemption of the Series D
Preferred Stock, and no holder thereof shall have any right to have his or her
shares of Series D Preferred Stock redeemed by the Corporation, if at that time
such redemption is not permitted by the terms and provisions of the Indenture or
any refinancing thereof.

5.   No Impairment of Rights.
     ----------------------- 

     Other than pursuant to the provisions of Section E hereunder, the
Corporation will not, by amendment of the Articles of Incorporation or through
any reorganization, transfer of assets, consolidation, merger, dissolution,
issue or sale of securities or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms of the Series D
Preferred Stock set forth herein, and will at all times in good faith assist  in
the carrying out of all such terms and in the taking of all such actions as may
be necessary or appropriate in order to protect the rights of the holders of the
Series D Preferred Stock against dilution or other impairment.

6.   Issuance of Series D Preferred Stock.
     ------------------------------------ 

     The Series D Preferred Stock shall only be issued in connection with the
consummation of the Series A Convertible Preferred Stock Purchase Agreement
dated as of March 6, 1997, among the Corporation and the Purchasers named
therein.

        E.  AMENDMENT OF RIGHTS, DESIGNATIONS AND PREFERENCES HEREUNDER.
            ----------------------------------------------------------- 

     The holders of at least 66% of the then outstanding Series A Preferred
Stock, Series B Preferred Stock, Series C Preferred Stock and Series D Preferred
Stock voting together as a single class, shall have the authority to bind the
holders of all of the then outstanding shares of Series A Preferred Stock,
Series B Preferred Stock, Series C Preferred Stock and Series D Preferred Stock
on all matters related to the rights and preferences of such shares, including a
waiver of any of the rights and preferences afforded to such holders hereunder.

     IN WITNESS WHEREOF, SBA Communications Corporation has caused its corporate
seal to be hereunto affixed and this statement to be executed by its President
and Secretary this 24th day of February, 1998.

                                      /s/ Steven E. Bernstein
(CORPORATE SEAL)                    ___________________________________
                                    Steven E. Bernstein, President


                                      /s/ Robert M. Grobstein
                                    ___________________________________
                                    Robert M. Grobstein, Secretary


                                       40