Execution Copy


                          SECOND SUPPLEMENTAL INDENTURE


                          DATED AS OF FEBRUARY 1, 2000





                         ALLIANT ENERGY RESOURCES, INC.,
                                    Company,


                           ALLIANT ENERGY CORPORATION,
                                  As Guarantor

                                       and

                               FIRSTAR BANK, N.A.,
                                   as Trustee





                      Second Supplemental Indenture to the
                                    Indenture
                          dated as of November 4, 1999




               SECOND SUPPLEMENTAL INDENTURE,  dated as of February 1, 2000 (the
"Second  Supplemental  Indenture"),  among  ALLIANT  ENERGY  RESOURCES,  INC., a
Wisconsin corporation (the "Company"),  ALLIANT ENERGY CORPORATION,  a Wisconsin
corporation, as guarantor (the "Guarantor"),  and FIRSTAR BANK, N.A., as Trustee
(the "Trustee").

                    RECITALS OF THE COMPANY AND THE GUARANTOR

               The  Company  and the  Guarantor  have  heretofore  executed  and
delivered  to the  Trustee  an  Indenture,  dated  as of  November  4,  1999 (as
supplemented  by the First  Supplemental  Indenture dated as of November 4, 1999
and  as  may be  further  supplemented  and  amended  from  time  to  time,  the
"Indenture"),  providing  for the  issuance  from time to time of the  Company's
unsecured  unsubordinated  debentures,  notes or other evidences of indebtedness
(the  "Securities"),  to be issued  in one or more  series  as  provided  in the
Indenture.

               It is provided in Section 2.02 of the Indenture that the Company,
the Guarantor and the Trustee may enter into indentures  supplemental thereto to
establish the form or terms of Securities of any series.

               The Company and the Guarantor  desire to supplement and amend the
Indenture to allow for the issuance of  Securities  to be initially  sold within
the United States to U.S.  Persons that are Qualified  Institutional  Buyers and
Institutional  Accredited  Investors  and  issued  in the  form  of one or  more
Restricted  Global Securities  deposited with the Trustee,  as custodian for the
Depositary,  and  registered  in the name of a nominee  of the  Depositary,  and
Restricted Physical Securities.

               The Company and the  Guarantor  desire to set forth the terms and
form of a new  series  of  Restricted  Securities  to be known as the  Company's
Exchangeable Senior Notes due 2030 (the "PAY PHONES" or the "PHONES"), which are
exchangeable  for cash based on the value of  McLeodUSA  Incorporated's  Class A
Common Stock,  initially  limited to an aggregate number of 5,166,052 PHONES (or
up to 5,940,960 if additional  PHONES are issued in connection with the exercise
by the  Initial  Purchaser  (as such term is defined in the  Purchase  Agreement
dated  January  26,  2000  among the  Company,  the  Guarantor  and the  Initial
Purchaser  named  therein) of its  over-allotment  option)  and  unconditionally
guaranteed by the Guarantor.

               The  PHONES,   the  related  guarantee  and  the  certificate  of
authentication to be borne by the PHONES are to be substantially in the form set
forth in Exhibit A hereto.



               NOW, THEREFORE, THIS SECOND SUPPLEMENTAL INDENTURE WITNESSETH:

               For and in  consideration of the premises and the purchase of the
PHONES by the Holders (as defined herein) thereof, it is mutually covenanted and
agreed as  follows  for the equal and  ratable  benefit  of the  Holders  of the
PHONES:

                                   ARTICLE 1.

                                   AMENDMENTS

               Section  1.01.  Article 1 of the  Indenture  shall be  amended by
inserting in Section 1.01 the following new terms with the following definitions
in the appropriate alphabetic positions:

               "Closing  Time" means,  with  respect to the PHONES,  February 1,
2000,  the date of  initial  issuance  of the  PHONES  issued  under the  Second
Supplemental Indenture.

               "First  Supplemental  Indenture"  means  the  First  Supplemental
Indenture dated as of November 4, 1999 among the Company,  the Guarantor and the
Trustee.

               "PHONES"  has the meaning set forth in the  preamble  and Section
2.01  of  the  Second   Supplemental   Indenture.   The  term  PHONES  shall  be
interchangeable with the term "PAY PHONES."

               "Registration  Rights  Agreement"  means,  with  respect  to  the
PHONES,  the  Registration  Rights Agreement dated as of February 1, 2000, among
the Company,  the  Guarantor  and Merrill Lynch & Co.,  Merrill  Lynch,  Pierce,
Fenner & Smith Incorporated, as the initial purchaser.

               "Second  Supplemental  Indenture"  means the Second  Supplemental
Indenture dated as of February 1, 2000 among the Company,  the Guarantor and the
Trustee.

               Section 1.02 The Indenture  shall be amended by adding an exhibit
titled  "Exhibit E." Exhibit E to the Indenture  shall be the form of PHONES and
the related guarantee attached as Exhibit A hereto.


                                       2


                                   ARTICLE 2.

                            PROVISIONS FOR THE PHONES

               Section  2.01.  There  shall be a series of  Securities  entitled
"Exchangeable Senior Notes due 2030" (herein designated the "PHONES").  The form
of the  PHONES,  the  Guarantees  issued  by the  Guarantor  and  the  Trustee's
certificate of  authentication to be borne thereby shall be substantially in the
forms set forth in Exhibit A hereto  and shall be  executed,  authenticated  and
delivered in  accordance  with the  provisions  of, and shall in all respects be
subject to, all of the terms, conditions and covenants of the Indenture and this
Second Supplemental Indenture,  including, but not limited to, the provisions of
the Indenture with respect to the transfer,  exchange and  replacement  thereof.
The aggregate number,  and the Original  Principal Amount (as defined below), of
the PHONES that may be executed by the Company and  authenticated by the Trustee
hereunder shall be limited to 5,166,052 and $350,000,023, respectively (or up to
5,940,960 and  $402,500,040,  respectively,  if additional  PHONES are issued in
connection  with the  exercise by the Initial  Purchaser  of its  over-allotment
option);  provided,  however,  any exchanges or  replacements of the PHONES made
pursuant to the Indenture and the Second  Supplemental  Indenture  following the
original issuance thereof shall not be counted against this limit.

               Section 2.02. In accordance  with the terms and conditions of the
Indenture,  the Company may issue and sell the PHONES  inside the United  States
without  registration  under the  Securities  Act in  reliance  on Rule 144A and
Regulation D thereunder.

               Section  2.03.  Except as  provided  below,  the PHONES  shall be
represented  initially  in  the  form  of a  Restricted  Global  Security.  Each
Restricted  Global  Security shall be registered in the name of a nominee of the
Depositary and deposited on behalf of the  purchasers of the PHONES  represented
thereby  with a  custodian  for the  Depositary  for  credit  to the  respective
accounts  of the  purchasers  (or to such other  accounts  as they may  direct).
Except as set forth below,  each Restricted Global Security shall be in the form
of the PHONES attached hereto as Exhibit A and may be transferred,  in whole and
not in part,  only to another nominee of the Depositary or to a successor of the
Depositary or its nominee.

               Notwithstanding   the  above,   PHONES   sold  to   Institutional
Accredited Investors who are not Qualified  Institutional Buyers shall be issued
in certificated,  fully registered form (a "Restricted  Physical  Security").  A
Restricted  Physical  Security shall be subject to  restrictions  on transfer in
accordance  with the IAI Letter  that such  investor  shall be required to sign,
substantially in the form attached to the Indenture as Exhibit D.


                                       3


               Section 2.04. (a) Each Restricted Global Security,  or any PHONES
that may be issued in exchange for an interest in a Restricted  Global Security,
shall be dated as provided in Section  2.03 of the  Indenture,  shall  mature on
February  15, 2030 and shall bear  interest  quarterly in an amount equal to the
sum of $1.2280 per PHONES, reflecting a basic interest rate of 7.25% per year on
the Original  Principal  Amount through  February 15, 2003, and thereafter in an
amount equal to $0.4234 per PHONES,  reflecting a Basic  Interest  Rate of 2.50%
per year on the Original  Principal Amount, in each case plus an amount equal to
any regular cash dividends  paid on the Reference  Shares  attributable  to each
PHONES. The Company will also distribute,  as additional interest on the PHONES,
any  property,   including  cash  (other  than  any  regular  cash   dividends),
distributed  on or with respect to the  Reference  Shares  (other than  publicly
traded  equity  securities,  which will  themselves  become  Reference  Shares).
Interest on the PHONES  shall be paid  quarterly  in arrears on February 15, May
15,  August 15 and November 15 of each year,  beginning May 15, 2000, to holders
of record at the close of business  on February 1, May 1, August 1 and  November
1, as the case may be, immediately  preceding the payment date (whether or not a
business day), but subject to the Company's right to defer quarterly payments of
basic interest beginning after the February 15, 2003 payment.

               (b) Both principal of and interest on the PHONES shall be payable
at the office of the Paying Agent in the Milwaukee, Wisconsin and the Borough of
Manhattan,  The City of New York, New York or at any other office  maintained by
the Company or the  Guarantor,  as the case may be, for such  purpose;  provided
that interest may be payable, at the option of the Company or the Guarantor,  as
the case  may be,  by check  mailed  to the  registered  address  of the  person
entitled  thereto as such  address  shall  appear on the  registry  books of the
Company.  On each interest  payment date the Trustee shall pay to the registered
holder  interest  accrued in respect of such  PHONES.  Payment of  principal  on
PHONES  shall be paid to the  registered  holder  or upon his  order  only  upon
presentation  and  surrender  for payment of such PHONES on or after the payment
date at the  offices  of the  Company or the  Guarantor,  as the case may be, in
Milwaukee,  Wisconsin  and the Borough of Manhattan,  The City of New York,  New
York or at any other office of the Company or the Guarantor, as the case may be,
maintained for such purpose.

               (c) The PHONES shall not be convertible  into or exchangeable for
equity securities of the Company, the Guarantor or McLeodUSA Incorporated.

               (d) The PHONES shall not be subject to any sinking fund.

               (e) The Trustee,  at its Corporate  Trust Office  located at 1555
North RiverCenter Drive, Suite 301, Milwaukee,  Wisconsin 53212, shall initially
act as Paying Agent for the PHONES.


                                       4


               Section 2.05.  (a) So long as a nominee of the  Depositary is the
registered  owner of any  Restricted  Global  Security,  such  nominee  shall be
considered  the  sole  owner  and  holder  of the  PHONES  represented  by  such
Restricted  Global  Security under the Indenture,  as  supplemented  and amended
hereby.  Except  as  herein  provided,  owners of  beneficial  interests  in any
Restricted  Global Security shall not be entitled to have PHONES  represented by
such Restricted Global Security  registered in their names, shall not receive or
be entitled to receive  physical  delivery  of PHONES in  certificated  form and
shall not be considered the owners or holders thereof under the Indenture.

               (b) None of the Company,  the Guarantor or the Trustee shall have
any  responsibility  or liability  for any aspect of the records  relating to or
payments made on account of  beneficial  ownership  interests in any  Restricted
Global  Security,  or for  maintaining,  supervising  or  reviewing  any records
relating to such beneficial interests.

               Section  2.06  Income Tax  Characterization.  The Company and the
Holders (by virtue of their  acceptance of the PHONES) shall treat the PHONES as
indebtedness  of the Company for all tax  purposes.  The  Company  shall  hereby
instruct the Trustee to treat the PHONES as  indebtedness of the Company for all
tax reporting purposes.  The Company, the Trustee and the Holders shall not take
any  position  that  is  inconsistent  with  the  treatment  of  the  PHONES  as
indebtedness of the Company for all tax purposes.


                                   ARTICLE 3.

                                  MISCELLANEOUS

               Section 3.01. Capitalized terms used but not defined herein shall
have the  respective  meanings set forth in the Indenture and the form of PHONES
attached hereto as Exhibit A.

               Section  3.02.  The form of PHONES,  and the  related  guarantee,
attached  hereto as Exhibit A,  constitute a part of the provisions with respect
to the PHONES and are incorporated  into this Second  Supplemental  Indenture in
its  entirety  and shall for all  purposes  have the same effect as if fully set
forth in this Second Supplemental Indenture.

               Section 3.03.  Except as  supplemented  and amended  hereby,  the
Indenture as supplemented and amended by the First Supplemental  Indenture is in
all  respects  ratified  and  confirmed,  and all of the terms,  provisions  and
conditions thereof shall be and remain in full force and effect, and this Second
Supplemental Indenture and all its provisions shall be deemed a part thereof.


                                       5


               Section 3.04.  In case any provision in this Second  Supplemental
Indenture shall be invalid, illegal or unenforceable, the validity, legality and
enforceability  of the remaining  provisions shall not in any way be affected or
impaired thereby.

               Section  3.05.  If any  provision  of  this  Second  Supplemental
Indenture  limits,  qualifies or conflicts with any other provision hereof or of
the Indenture which provision is required to be included in the Indenture by any
of the  provisions of the Trust  Indenture  Act, such required  provision  shall
control.

               Section  3.06.  THIS  SECOND  SUPPLEMENTAL   INDENTURE  SHALL  BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE  WITH THE LAWS OF THE STATE OF WISCONSIN
WITHOUT REGARD TO THE CONFLICTS OF LAWS AND RULES OF SAID STATE.

               Section  3.07.  This  Second  Supplemental   Indenture  has  been
simultaneously  executed in several counterparts,  each of which shall be deemed
to be an original,  and all such counterparts shall together  constitute but one
and the same  instrument.  Delivery by telecopier of an executed  signature page
hereto shall be effective as delivery of a manually executed counterpart hereof.

               Section 3.08. This Second Supplemental  Indenture shall be deemed
to have been executed on the date of the  acknowledgment  thereof by the officer
of the Trustee who signed it on behalf of the Trustee.



                                       6


               IN WITNESS  WHEREOF,  the Company,  the Guarantor and the Trustee
have  caused  their  names to be  signed  hereto  by their  respective  officers
thereunto duly authorized and their respective  corporate seals,  duly attested,
to be hereunto affixed, all as of the day and year first above written.

                                        ALLIANT ENERGY RESOURCES, INC.
ATTEST:



By: /s/ Enrique Bacalao                 By: /s/ Edward M. Gleason
    ------------------------------          ----------------------------------
    Name: Enrique Bacalao                   Name: Edward M. Gleason
    Title: Assistant Secretary              Title: Vice President-Treasurer and
                                                   Corporate Secretary


                                        ALLIANT ENERGY CORPORATION,
ATTEST:                                 as Guarantor



By: /s/ Enrique Bacalao                 By: /s/ Edward M. Gleason
    ------------------------------          ----------------------------------
    Name: Enrique Bacalao                   Name: Edward M. Gleason
    Title: Assistant Secretary              Title: Vice President-Treasurer and
                                                   Corporate Secretary


                                        FIRSTAR BANK, N.A.,
                                        as Trustee



                                        By: /s/ R. Christian Davis
                                            ----------------------------------
                                            Name: R. Christian Davis
                                            Title: Vice President



                                       7


                                                                       Exhibit A
NY3: 209294.06
                                [Form of PHONES]

               Unless  this   certificate   is   presented   by  an   authorized
representative of The Depository Trust Company, a New York corporation  ("DTC"),
to Alliant Energy  Resources,  Inc., or its agent for  registration of transfer,
exchange or payment,  and any  certificate  issued is  registered in the name of
Cede & Co. or to such other  entity or in such other name as is  requested by an
authorized  representative  of DTC (and any payment hereon is made to Cede & Co.
or to such other entity as is requested by an authorized representative of DTC),
ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR  OTHERWISE  BY OR TO ANY
PERSON IS  WRONGFUL  since  the  registered  owner  hereof,  Cede & Co.,  has an
interest herein.

               Transfers of this Global  Security  shall be limited to transfers
in whole,  but not in part, to nominees of Cede & Co. or to a successor  thereof
or such  successor's  nominee and transfers of portions of this Global  Security
shall be limited to transfers made in accordance with the restrictions set forth
in Section 2.20 of the Indenture referred to in this Global Security.

               THESE  SECURITIES HAVE NOT BEEN  REGISTERED  UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE OR OTHER SECURITIES
LAWS.  NEITHER THIS  SECURITY NOR ANY  INTEREST OR  PARTICIPATION  HEREIN MAY BE
REOFFERED,  SOLD,  ASSIGNED,  TRANSFERRED,   PLEDGED,  ENCUMBERED  OR  OTHERWISE
DISPOSED OF IN THE ABSENCE OF SUCH  REGISTRATION  OR UNLESS THE  TRANSACTION  IS
EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION  REQUIREMENTS OF THE SECURITIES
ACT.  BY ITS  ACQUISITION  HEREOF,  THE HOLDER (1)  REPRESENTS  THAT (A) IT IS A
"QUALIFIED  INSTITUTIONAL  BUYER" ("QIB") (AS DEFINED IN RULE 144A ("RULE 144A")
UNDER THE SECURITIES ACT) OR (B) IT IS AN  INSTITUTIONAL  "ACCREDITED  INVESTOR"
WITHIN THE MEANING OF  SUBPARAGRAPHS  (a)(1),  (2), (3) OR (7) OF RULE 501 UNDER
THE  SECURITIES  ACT THAT IS ACQUIRING  THIS SECURITY FOR ITS OWN ACCOUNT OR FOR
THE ACCOUNT OF SUCH INSTITUTIONAL  ACCREDITED  INVESTOR FOR INVESTMENT  PURPOSES
AND NOT WITH A VIEW TO OR FOR OFFER OR SALE IN CONNECTION WITH, ANY DISTRIBUTION
IN VIOLATION OF THE  SECURITIES  ACT (2) AGREES NOT TO OFFER,  SELL OR OTHERWISE
TRANSFER THIS SECURITY PRIOR TO (X) THE DATE WHICH IS TWO YEARS (OR SUCH SHORTER
PERIOD OF TIME AS PERMITTED BY RULE 144(K) UNDER THE  SECURITIES  ACT) AFTER THE
LATER OF THE ORIGINAL  ISSUE DATE OF THE  SECURITIES  AND THE LAST DATE ON WHICH
ALLIANT ENERGY RESOURCES, INC. OR ANY "AFFILIATE"



(AS DEFINED IN RULE 144 UNDER THE SECURITIES  ACT) OF ALLIANT ENERGY  RESOURCES,
INC. WAS THE OWNER OF THIS SECURITY (OR ANY PREDECESSOR OF THIS SECURITY) OR (Y)
SUCH LATER  DATE,  IF ANY, AS MAY BE REQUIRED  BY  APPLICABLE  LAW (THE  "RESALE
RESTRICTION TERMINATION DATE") EXCEPT (A) TO ALLIANT ENERGY RESOURCES, INC., (B)
PURSUANT TO A REGISTRATION  STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE
SECURITIES  ACT,  (C) FOR SO LONG AS THE  SECURITIES  ARE  ELIGIBLE  FOR  RESALE
PURSUANT  TO RULE  144A,  TO A PERSON IT  REASONABLY  BELIEVES  IS A  "QUALIFIED
INSTITUTIONAL  BUYER" AS DEFINED IN RULE 144A THAT PURCHASES FOR ITS OWN ACCOUNT
OR FOR THE  ACCOUNT OF A  QUALIFIED  INSTITUTIONAL  BUYER,  IN EACH CASE TO WHOM
NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (D) TO
AN  INSTITUTIONAL  "ACCREDITED  INVESTOR"  WITHIN THE  MEANING OF  SUBPARAGRAPHS
(a)(1),  (2), (3) or (7) OF RULE 501 UNDER THE  SECURITIES ACT THAT IS ACQUIRING
THIS  SECURITY  FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF SUCH AN  INSTITUTIONAL
ACCREDITED INVESTOR FOR INVESTMENT PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER
OR SALE IN CONNECTION  WITH, ANY DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT
OR  (E)  PURSUANT  TO  ANOTHER   AVAILABLE   EXEMPTION  FROM  THE   REGISTRATION
REQUIREMENTS OF THE SECURITIES ACT SUBJECT IN EACH OF THE FOREGOING CASES TO ANY
REQUIREMENT OF LAW THAT THE  DISPOSITION OF ITS PROPERTY OR THE PROPERTY OF SUCH
INVESTOR  ACCOUNT OR ACCOUNTS BE AT ALL TIMES WITHIN ITS OR THEIR  CONTROL,  AND
(3) AGREES THAT IT WILL GIVE TO EACH PERSON TO WHOM THIS SECURITY IS TRANSFERRED
A NOTICE  SUBSTANTIALLY  TO THE EFFECT OF THIS  LEGEND;  PROVIDED  THAT  ALLIANT
ENERGY  RESOURCES,  INC. AND THE TRUSTEE  SHALL HAVE THE RIGHT PRIOR TO ANY SUCH
OFFER,  SALE OR  TRANSFER  (I)  PURSUANT  TO CLAUSE  (D) OR (E) TO  REQUIRE  THE
DELIVERY  OF AN OPINION  OF  COUNSEL,  CERTIFICATION  AND/OR  OTHER  INFORMATION
SATISFACTORY TO EACH OF THEM, AND (II) IN EACH OF THE FOREGOING  CASES, BUT ONLY
IF THIS SECURITY IS NOT A GLOBAL SECURITY (AS DEFINED IN THE INDENTURE  REFERRED
TO HEREIN), TO REQUIRE THAT A CERTIFICATION OF TRANSFER IN THE FORM APPEARING ON
THE OTHER SIDE OF THIS SECURITY IS COMPLETED AND DELIVERED BY THE  TRANSFEROR TO
ALLIANT ENERGY RESOURCES, INC. AND THE TRUSTEE. THIS LEGEND WILL BE REMOVED UPON
THE REQUEST OF THE HOLDER AFTER THE RESALE RESTRICTION TERMINATION DATE.



                         ALLIANT ENERGY RESOURCES, INC.

                       Exchangeable Senior Notes due 2030

                    (Exchangeable for cash based on value of
                  McLeodUSA Incorporated Class A Common Stock)

CUSIP No.

________ PHONES

Global Note

               Alliant Energy Resources,  Inc., a corporation duly organized and
existing  under the laws of the State of Wisconsin  (the  "Company,"  which term
includes any successor person under the Indenture  hereinafter referred to), for
value received,  hereby promises to pay to Cede & Co. or registered assigns, the
Maturity  Amount  (as  defined  below) at the  office  or agency of the  Company
referred to below,  in such coin or currency of the United  States of America as
at the time of payment is legal  tender  for the  payment of public and  private
debts,  upon  presentation and surrender of this PHONES on the 15th of February,
2030  (the  "Maturity  Date")  and to pay  interest  ("Basic  Interest")  on the
Original  Principal Amount (as defined below) from the date of original issuance
or from the most  recent  Interest  Payment  Date (as  defined  below)  to which
interest has been paid or duly provided for, as more fully described below.

               Payment of Basic Interest may be deferred, at the election of the
Company as specified  herein.  Additional  Interest (as defined below),  if any,
shall be distributed as specified  herein.  As of the date of original  issuance
hereof,  0.8772  Reference  Shares (as defined  below) is  attributable  to each
PHONES represented hereby, subject to adjustment as provided herein.

               This PHONES is a "book-entry" security and is being registered in
the name of Cede & Co. as nominee of The  Depository  Trust Company  ("DTC"),  a
clearing agency. Subject to the terms of the Indenture,  dated as of November 4,
1999 (as supplemented by the First  Supplemental  Indenture dated as of November
4, 1999, the Second Supplemental  Indenture dated February 1, 2000 and as may be
further supplemented and amended from time to time, the "Indenture"),  among the
Company,  Alliant Energy Corporation (the "Guarantor"),  and Firstar Bank, N.A.,
as trustee (the "Trustee"),  and except as provided therein, this PHONES will be
held by a clearing agency or its nominee,  and beneficial interests will be held
by beneficial  owners through the book-entry  facilities of such clearing agency
or its nominee.


                                       2


               The statements set forth in the  restrictive  legend above are an
integral part of the terms of this PHONES and by  acceptance  hereof each holder
of this PHONES agrees to be subject to and bound by the terms and provisions set
forth in such legend.

               This  PHONES  is one of a duly  authorized  issue  of  unsecured,
unsubordinated debentures, notes or other evidences of indebtedness (hereinafter
called the  "Securities")  of the Company of the series  hereinafter  specified,
which PHONES  initially  are limited in aggregate  number to 5,166,052 (or up to
5,940,960 if additional PHONES are issued in connection with the exercise by the
Initial Purchaser (as such term is defined in the Purchase Agreement dated as of
January 26, 2000 among the  Company,  the  Guarantor  and the Initial  Purchaser
named therein) of its  over-allotment  option) PHONES and an aggregate  Original
Principal  Amount  of  $350,000,023  (or  up  to  $402,500,040  if  the  Initial
Purchaser's  over-allotment option is exercised),  all such Securities issued or
to be issued under the Indenture. Terms defined in the Indenture and not defined
herein have the meaning  ascribed  thereto in the Indenture.  The Securities are
subject to all such  terms,  and Holders are  referred  to the  Indenture  for a
statement of those terms.  As provided in the  Indenture,  the Securities may be
issued in one or more series,  which  different  series may be issued in various
aggregate  principal  amounts,  may be denominated in currencies other than U.S.
Dollars  (including  composite  currencies),  may mature at different times, may
bear  interest,  if  any,  at  different  rates,  may be  subject  to  different
redemption provisions, if any, may be subject to different sinking fund or other
purchase provisions, if any, may be subject to different covenants and Events of
Default and may otherwise vary as in the Indenture  provided or permitted.  This
PHONES is one of a series of the Securities  designated as  Exchangeable  Senior
Notes Due 2030,  which are exchangeable for cash based on the value of McLeodUSA
Incorporated's Class A Common Stock.

               The Maturity  Amount,  the Redemption  Amount (as defined below),
Additional  Interest  and Basic  Interest on the PHONES  shall be payable at the
office or agency the Company or the Guarantor, as the case may be, maintains for
such purpose within Milwaukee,  Wisconsin and the Borough of Manhattan, the City
of New York, New York, or at the Company's option, any such payments of cash may
be made by check  mailed  to the  Holders  of the  PHONES  at  their  respective
addresses  set forth in the  register of Holders of PHONES.  The PHONES shall be
issued in denominations of one PHONES and integral multiples thereof.

1.  Interest

               The Company  shall pay Basic  Interest on the Original  Principal
Amount  from the date of  original  issuance  or from the most  recent  Interest
Payment Date to which  interest has been paid or duly  provided for in an amount
equal to $1.2280 per PHONES,


                                       3


reflecting a basic  interest  rate of 7.25% per annum on the Original  Principal
Amount,  through February 15, 2003, and thereafter in an amount equal to $0.4234
per PHONES,  reflecting a basic interest rate of 2.50% per annum on the Original
Principal Amount (as applicable,  the "Basic Interest Rate"),  in each case plus
the  amount  of  any  regular  cash  dividends  paid  on  the  Reference  Shares
attributable to each PHONES. Interest on the PHONES will accrue from the date of
issuance and will be paid quarterly in arrears on February 15, May 15, August 15
and November 15 of each year (each, an "Interest Payment Date" and collectively,
the "Interest  Payment Dates" and each quarterly  period ending on such Interest
Payment  Date, an "Interest  Payment  Period"),  beginning  May 15, 2000,  until
payment of the Maturity Amount,  or if redeemed  earlier,  the Redemption Amount
(as defined  below) or until  earlier  exchanged  upon  exercise of the Exchange
Right (as defined  below) by the Holder hereof.  The Company's  first payment of
Basic  Interest  on May 15,  2000  shall  equal  $1.4327  per  PHONES,  which is
calculated  to equal an annual rate of 7.25% on the  Original  Principal  Amount
from the date hereof.

               Basic  Interest  payable  on  any  Interest  Payment  Date  shall
(subject to exceptions  provided in the Indenture referred to herein) be paid to
the person in whose name this PHONES,  or the PHONES in exchange or substitution
for which this PHONES shall have been issued,  shall have been registered at the
close of  business on February 1, May 1, August 1 or November 1 (each a "Regular
Record Date"), as the case may be,  immediately  preceding such Interest Payment
Date whether or not a Business Day (as defined below). Changes in the Contingent
Principal  Amount  (as  defined  below)  shall not  affect  the  amount of Basic
Interest.  At least five (5) Business Days prior to each Interest  Payment Date,
the Company shall deliver an Officers' Certificate to the Trustee setting forth:
(i) the amount of Basic Interest per PHONES for such  quarterly  period and (ii)
the  total  quarterly  interest  due for such  quarterly  period  on all  PHONES
outstanding.

               The Company  shall also  distribute to the Holder of each PHONES,
an amount  equal to any  property,  including  cash (other than any regular cash
dividends),  distributed on or with respect to the Reference Shares attributable
to each PHONES  (other  than  publicly  traded  equity  securities,  which shall
themselves become Reference Shares) ("Additional  Interest").  If any Additional
Interest includes publicly traded securities (other than equity securities) that
can be transferred by the Company to the Holders without  registration under the
federal  securities laws and without breach of any  contractual  arrangements of
the Company with McLeodUSA Incorporated, and that will be freely transferable in
the hands of the Holders,  such securities shall be distributed to the Holder of
each PHONES; provided however, that no fractional units of such securities shall
be distributed, and the Company shall distribute cash representing the then fair
market value of such  fractional  units of such securities as determined in good
faith by the Board of  Directors.  If any  Additional  Interest is not  publicly
traded securities or is publicly


                                       4


traded  securities not meeting the above standards,  cash  representing the then
fair market value of such property (as  determined in good faith by the Board of
Directors) shall be distributed to the Holder of each PHONES.

               Additional  Interest  shall be  distributed to the Holder of each
PHONES  on  the  twentieth  (20th)  Business  Day  (the   "Additional   Interest
Distribution  Date") after the Reference Shares  Distribution  Date.  "Reference
Shares  Distribution Date" means the date on which any property,  including cash
(other than any regular cash  dividends),  distributed on or with respect to the
Reference  Shares shall be distributed to the holders of Reference  Shares.  The
record  date for any  distribution  of  Additional  Interest  shall be the tenth
(10th) Business Day after the Reference Shares Distribution Date.

               At least five (5) Business Days prior to any Additional  Interest
Distribution  Date,  the Company shall deliver an Officers'  Certificate  to the
Trustee setting forth:  (i) the amount of Additional  Interest to be distributed
per PHONES;  and (ii) the total amount of Additional  Interest to be distributed
for all outstanding PHONES on such Additional Interest Distribution Date. If any
Additional  Interest  consists  of any  property  that  is not  publicly  traded
securities or is publicly traded securities not meeting the standards  described
above,  then at least five (5) Business Days prior to such  Additional  Interest
Distribution  Date,  the Company shall  deliver to the Trustee:  (i) a certified
copy of a Board Resolution  establishing the fair market value of such property;
and (ii) an  Officers'  Certificate  setting  forth (A) the total amount of cash
relating to the fair market value of such property to be distributed per PHONES,
and (B) the  total  amount of cash  relating  to the fair  market  value of such
property to be distributed  for all outstanding  PHONES.  In each case described
above,  the Company shall state in such Officers'  Certificate  whether it shall
distribute such Additional  Interest in property or cash. The Trustee shall only
be  responsible  for  distributing  Additional  Interest  in the form of cash or
global  book-entry  securities  which are DTC  eligible.  The  Company  shall be
responsible  for acting as its own paying agent to make all other  distributions
of Additional  Interest.  The Company shall prepare a press release  relating to
any  such  distribution  of  Additional  Interest  to be  provided  to  DTC  for
dissemination through the DTC broadcast facility.

               If Basic  Interest  or  Additional  Interest is payable on a date
that is not a Business Day,  payment shall be made on the next Business Day (and
without any  interest or other  payment in respect of such  delay).  A "Business
Day" means any day that is not a Saturday,  a Sunday or a legal holiday or a day
on which  banking  institutions  or trust  companies in The City of New York are
authorized or obligated by law to close.

               The  Company  shall  pay  interest  at a rate  equal to the Basic
Interest Rate per annum then in effect on (i) any overdue Maturity Amount;  (ii)
any overdue  installments of Basic Interest;  and (iii) any overdue  payments of
Additional Interest based


                                       5


on the fair market  value of such  Additional  Interest,  in each case,  without
regard to any  applicable  grace  period.  Notwithstanding  any other  provision
herein,  no  interest  shall  accrue  or  be  payable  in  accordance  with  the
immediately  preceding  sentence  on any  Deferred  Basic  Interest  (as defined
below).

               Interest  on the  PHONES  shall  be  computed  on the  basis of a
360-day year of twelve 30-day months.

2.  Deferral of Interest Payments

               If no Event of Default has occurred and is  continuing  under the
PHONES, the Company may, on one or more occasions,  beginning after the February
15, 2003 payment,  defer payments of Basic Interest  ("Deferred Basic Interest")
for up to twenty  (20)  consecutive  quarterly  periods.  Any  deferral of Basic
Interest may not extend beyond the Maturity  Date, and the Company may not defer
distributions of Additional Interest or quarterly payments equal to regular cash
dividends paid on the maximum number of Reference Shares.

               If the Company defers payments of Basic Interest,  the Contingent
Principal  Amount  shall  increase  during  each  quarter  by the amount of such
Deferred Basic Interest (plus accrued  interest  thereon at an annual rate equal
to 2.50%,  compounded  quarterly  ("Accrued  Interest") ) and the Early Exchange
Ratio (as defined  below) shall be 100% of the Reference  Shares for the quarter
following such  deferral.  Once the Company has paid all Deferred Basic Interest
(plus Accrued  Interest),  together with the Basic Interest for the then current
quarterly period,  the Contingent  Principal Amount shall decrease by the amount
of the payment of such Deferred  Basic  Interest  (plus Accrued  Interest),  the
Early Exchange Ratio will change to 95% of the Reference Shares, and the Company
may again defer  Basic  Interest as  described  above.  The Company may only pay
Deferred Basic Interest (plus Accrued Interest) on an Interest Payment Date.

               If the Company elects to defer payments of Basic Interest for any
quarterly  period,  the Company  shall  provide the Trustee  with notice of such
election (a "Deferral  Notice") and shall  prepare a press  release  relating to
such deferral to be provided to DTC for dissemination  through the DTC broadcast
facility.  The  Deferral  Notice with respect to any  quarterly  period shall be
given to the Trustee not later than one (1)  Business Day before the earlier of:
(i) the Regular Record Date for the payment of Basic Interest for such quarterly
period;  or (ii) the date that the  Company is  required  to give  notice to The
Nasdaq Stock Market (or any other applicable self-regulatory organization) or to
the  Holders  of the PHONES as of such  Regular  Record  Date or the  applicable
Interest Payment Date.


                                       6


               The  Deferral  Notice  shall  be in  the  form  of  an  Officers'
Certificate to the Trustee  setting forth:  (i) the period with respect to which
the Company is electing to defer Basic Interest;  (ii) the amount of increase of
Contingent  Principal  Amount per PHONES;  (iii) the total amount of increase of
the Contingent  Principal  Amount for all outstanding  PHONES;  (iv) a statement
that the Early  Exchange Ratio will change to 100% of the Reference  Shares,  or
will  continue  at such  rate,  prospectively  from such date for the  following
quarter;  and (v) that no Event of Default has occurred and is continuing  under
the PHONES.  The Company  shall  deliver a Deferral  Notice for each deferral of
Basic Interest.

               If and when the Company pays all of the Deferred  Basic  Interest
and Accrued  Interest,  the Company  shall  deliver to the Trustee an  Officers'
Certificate  setting forth:  (i) the  calculation of Deferred Basic Interest and
Accrued  Interest  owed per  PHONES;  (ii) the total  amount of  Deferred  Basic
Interest and Accrued Interest owed on all outstanding PHONES;  (iii) a statement
that the  Early  Exchange  Ratio  will  change  to 95% of the  Reference  Shares
prospectively  from  such date for the  following  quarter;  (iv) the  amount of
decrease of the Contingent Principal Amount per PHONES; and (v) the total amount
of decrease of the Contingent Principal Amount for all outstanding PHONES.

3.  Principal Amount

               The  "Original  Principal  Amount" per PHONES is equal to $67.75.
The  minimum  amount  payable  upon  redemption  or maturity of each PHONES (the
"Contingent  Principal  Amount")  shall  be  initially  equal  to  the  Original
Principal  Amount.  The  Contingent  Principal  Amount for each  PHONES  will be
increased during each quarter,  based on the Contingent  Principal Amount at the
beginning of the Interest Payment Period, by an amount equal to interest accrued
on such beginning  Contingent Principal Amount at the Basic Interest Rate on the
PHONES  then in effect,  and,  on the dates the  following  amounts  are paid to
Holders of the PHONES,  will be reduced by: (a) each Basic Interest Payment made
on the  PHONES,  (b) any amounts  paid on the PHONES in respect of regular  cash
dividends  paid  on the  Reference  Shares  during  that  quarter  and  (c)  any
Additional  Interest  paid  on the  PHONES.  In no  event  will  the  Contingent
Principal Amount be less than zero.  Notwithstanding the foregoing, in the event
that the Company  redeems  the PHONES on a date which is between  February 6 and
February 15, 2003 (not  including  February 6 or February  15),  the  Contingent
Principal  Amount  will not be  increased  by an  amount  equal to the  interest
accrued on the beginning  Contingent  Principal  Amount for the Interest Payment
Period beginning on November 15, 2002.


                                       7


               For purposes of the Indenture, the "principal" of a PHONES on any
day and for any purpose  means the amount that is payable  with  respect to such
PHONES as of such date and for such purpose (including without limitation,  upon
any redemption at the option of the Company,  upon any exchange at the option of
the Holder of such  PHONES and upon the  acceleration  of the  maturity  of such
PHONES).  For purposes of the Indenture,  "Interest" on a PHONES for any purpose
includes  Basic  Interest,  any regular  cash  dividends  paid on the  Reference
Shares, Additional Interest and any Final Period Distribution.

               At  maturity,  the Holder of each  PHONES  shall be  entitled  to
receive the Maturity Amount.  The "Maturity  Amount" per PHONES means the higher
of: (i) the  Contingent  Principal  Amount of the PHONES on the Maturity Date or
(ii) the sum of (1) the then  Current  Market  Value (as  defined  below) of the
Reference  Shares on the Maturity Date  attributable  to each PHONES and (2) any
Deferred Basic Interest  (including any Accrued Interest),  plus, in the case of
either (i) or (ii), the Final Period Distribution.

               "Final Period  Distribution"  per PHONES means, in respect of (i)
the Maturity Date, a distribution determined in accordance with clauses (2), (3)
and (4) below and (ii) the Redemption  Date (as defined  below),  a distribution
determined  in  accordance  with  clauses (1),  (2),  (3) and (4) below.  If the
Redemption  Date is in connection  with a Rollover  Offering (as defined below),
the   distribution   determined  in  accordance  with  clause  (4)  shall  be  a
distribution  equal to all dividends and  distributions  on or in respect of the
Reference  Shares which a holder of the Reference Shares on the Pricing Date (as
defined below) would be entitled to receive.

          (1)  Unless (i) the Redemption  Date of the PHONES is also an Interest
               Payment  Date or (ii) Basic  Interest  has been  deferred for the
               then  current  quarterly  period,  an  amount  equal to the Basic
               Interest Rate accrued on the Original  Principal  Amount from the
               most recent Interest  Payment Date to the Redemption  Date, or to
               the next Interest Payment Date in the case of a redemption of the
               PHONES on a date which is between  February  6 and  February  15,
               2003 (not including February 6 or February 15), plus

          (2)  a   distribution   equal  to  the  sum  of  all   dividends   and
               distributions  on or in respect of the Reference  Shares declared
               by the  applicable  Reference  Company (as defined below) and for
               which the ex-date for the dividend or  distribution  falls during
               the period  from the date of  original  issuance of the PHONES to
               the most  recent  Interest  Payment  Date and which have not been
               distributed  to holders  of


                                       8


               Reference  Shares prior to the most recent Interest Payment Date,
               plus

          (3)  a   distribution   equal  to  the  sum  of  all   dividends   and
               distributions  on or in respect of the  Reference  Shares which a
               holder of Reference  Shares on the latest  ex-date for a dividend
               or distribution  occurring during the period from the most recent
               Interest Payment Date to the date immediately preceding the first
               Trading  Day (as  defined  below)  of the  Averaging  Period  (as
               defined below) is entitled to receive, plus

          (4)  a  distribution  equal to the sum of, for each  successive day in
               the Averaging  Period that is anticipated on the first day of the
               Averaging  Period to be a Trading Day, the amounts  determined in
               accordance with the following formula:

               E x (1 - 0.05n)

where:

               E=   all  dividends  and  distributions  on or in  respect of the
                    Reference  Shares which a holder of the Reference  Shares on
                    the  applicable  day would be entitled to receive,  provided
                    that the ex-date for the dividend or distribution  date that
                    occurs on a day that is not a scheduled Trading Day shall be
                    deemed  to  have  occurred  on  the  immediately   preceding
                    scheduled Trading Day; and

               n=   the number of  scheduled  Trading  Days that have elapsed in
                    the  Averaging  Period  with the  first  Trading  Day of the
                    Averaging Period being counted as zero.

               The  Holder  of  each   PHONES  is  only   entitled   to  receive
distributions  determined  in  accordance  with  clauses  (2), (3) or (4) to the
extent actually distributed by the applicable  Reference Company.  Distributions
related to cash amounts paid by the  applicable  Reference  Company on Reference
Shares as described in clauses (2), (3) or (4) before the Redemption Date or the
Maturity Date, as the case may be, shall be paid on the  Redemption  Date or the
Maturity Date, as the case may be.  Distributions  related to all other property
distributed,  or the cash value of such property,  shall be  distributed  within
twenty (20) Business Days after the Reference Shares Distribution Date.


                                       9


               Upon  maturity,  the  Company  shall  deliver  to the  Trustee an
Officers'  Certificate  (i)  informing  the Trustee of the  applicable  Maturity
Amount  per  PHONES  and in the  aggregate  for all  outstanding  PHONES and the
Company's  calculation  thereof  and (ii)  directing  the  Trustee to adjust the
Trustee's records and to request DTC to adjust DTC's records.

               Notwithstanding  any other  provision  hereof,  if the Contingent
Principal  Amount is reduced to zero or if all of the Reference  Shares cease to
be  outstanding,  the PHONES  shall  continue  to remain  outstanding  until the
Maturity Date unless the Company shall elect to earlier  redeem the PHONES,  and
each Holder of PHONES will receive the Contingent  Principal  Amount, if any, on
the Redemption Date or the Maturity Date, as applicable.

4.  Exchange Option

               The Holder of each  PHONES  shall  have a right,  at any time and
from time to time, to exchange (an  "Exchange  Right") each PHONES for an amount
of cash equal to a  percentage  of the then  Exchange  Market  Value (as defined
below) of the Reference Shares  attributable to each PHONES (the "Early Exchange
Ratio").  The Early Exchange Ratio at any time shall be equal to: (i) 95% of the
then Exchange Market Value of the Reference  Shares  attributable to each PHONES
or (ii) during a deferral of Basic Interest or, if the Company so elects, during
the pendency of any tender or exchange  offer for any of the  Reference  Shares,
100% of the then Exchange Market Value of the Reference  Shares  attributable to
each PHONES. The Company shall pay the Holder of each PHONES the amount due upon
exchange as soon as reasonably practicable after such Holder delivers notice (an
"Exchange  Notice") to the Trustee,  but in no event  earlier than three Trading
Days after the date of such  Exchange  Notice or later than fifteen (15) Trading
Days after the date of such Exchange Notice.

               "Exchange  Market  Value"  means the  Closing  Price (as  defined
below) on the  Trading  Day  following  the date a Holder of PHONES  delivers an
Exchange  Notice to the Trustee (an  "Exchange  Date");  provided,  however,  if
Exchange Notices relating to more than 200,000 PHONES have been delivered on any
Exchange Date, then the Exchange Market Value shall be the average Closing Price
on the five (5) Trading Days following  such Exchange Date. If Exchange  Notices
relating to more than 200,000  PHONES are  delivered on any Exchange  Date,  the
Trustee shall notify the Company of such fact by 6:00 p.m.,  New York City time,
on the Exchange  Date, and the Company shall give notice of such fact by issuing
a press release prior to 9:00 a.m., New York City time, on the next Trading Day,
which  shall be  provided to DTC for  dissemination  through  the DTC  broadcast
facility and to the Trustee. The Company's failure to provide this


                                       10


notice,  however, shall not affect the determination of Exchange Market Value as
described above.

               If the PHONES are held through DTC, the Holder of each PHONES may
exercise such Holder's Exchange Right through the relevant direct participant in
DTC through the DTC ATOP system by delivering an agent's  message and delivering
the PHONES of such  Holder to the  Trustee's  DTC  participant  account.  If the
PHONES are held in  certificated  form,  the Holder may exercise  such  Exchange
Right as follows:  the Holder shall (i)  complete and manually  sign an Exchange
Notice in the form available  from the Trustee and deliver such Exchange  Notice
to the Trustee at the office  maintained by the Trustee for such  purpose,  (ii)
surrender  such PHONES to the Trustee,  (iii) if required,  furnish  appropriate
endorsement and transfer  documents,  and (iv) if required,  pay all transfer or
similar taxes.

               By 12:00 noon, New York City time, on each Business Day following
receipt by the Trustee of notification from DTC that DTC has received an agent's
message from a DTC participant electing to exercise such participant's  Exchange
Right and delivery of such PHONES into the Trustee's DTC participant  account or
following  receipt of a complete  manually signed Exchange Notice and receipt of
the related PHONES from the Holder,  the Trustee shall notify the Company of the
amount of such  PHONES so  tendered.  The  Company  shall  deliver an  Officers'
Certificate  to the Trustee no later than one (1) Business Day after the Trading
Day following the Exchange Date;  provided however, if Exchange Notices relating
to more than  200,000  PHONES have been  delivered  on any  Exchange  Date,  the
Company shall deliver such Officers'  Certificate no later than one (1) Business
Day after the fifth  (5th)  Trading  Day  following  such  Exchange  Date.  Such
Officers'  Certificate  shall set forth the amount to be paid to such  tendering
Holder and the date of payment of such amount (the "Exchange Payment Date"). The
Company shall deposit such amount with the Trustee on the Exchange Payment Date,
and upon receipt of such payment from the Company, the Trustee shall pay DTC, as
soon as  practicable  or,  in the case of PHONES  that are held in  certificated
form, as directed by the tendering Holder.

               The date on which  all of the  foregoing  requirements  have been
satisfied shall be the Redemption Date with respect to the PHONES  delivered for
exchange.

5.  Redemption

               The Company may redeem, at any date (the "Redemption  Date"), the
PHONES  in whole  but not in part (a  "Redemption")  at a  redemption  price per
PHONES (the "Redemption  Amount") equal to the sum of: (i) the higher of (A) the
Contingent  Principal  Amount per PHONES or (B) the sum of (1) the then  Current
Market Value of


                                       11


the Reference Shares on the Redemption Date  attributable to each PHONES and (2)
any Deferred  Basic Interest  (plus Accrued  Interest) per PHONES;  plus, in the
case of either (A) or (B), the Final Period Distribution; and (ii) a "Redemption
Premium" in an amount  equal to $14.9407  per PHONES if the Company  redeems the
PHONES prior to the first quarterly  Interest  Payment Date on May 15, 2000, and
such amount as successively reduced by $1.2280 per PHONES if the Company redeems
the PHONES prior to each following  quarterly  Interest Payment Date through the
twelfth  quarterly  Interest  Payment Date on February 15, 2003;  except that no
such  amount  referred  to in this clause (ii) shall be payable in the event the
PHONES are redeemed  between  February 6 and  February  15, 2003 (not  including
February 6 or February 15). In addition, if any Additional Interest Distribution
Date falls after the Redemption  Date, the Company shall make such  distribution
on the Additional Interest Distribution Date.

               The "Current  Market Value" (other than in the case of a Rollover
Offering,  as defined below) is defined in respect of: (i) the Maturity Date, as
the average  Closing Price per  Reference  Share on the twenty (20) Trading Days
(the  "Averaging  Period")  immediately  prior to (but not  including) the fifth
(5th) Business Day preceding the Maturity Date; and (ii) the Redemption Date, as
the average  Closing  Price per  Reference  Share  during the  Averaging  Period
immediately  prior to (but not including) the fifth (5th) Business Day preceding
the Redemption  Date;  provided,  however,  that for purposes of determining the
payment  required  upon  Redemption  in  connection  with a  Rollover  Offering,
"Current  Market  Value"  means the  Closing  Price per  Reference  Share on the
Trading Day immediately  preceding the date that the Rollover Offering is priced
(the "Pricing Date") or, if the Rollover Offering is priced after 4:00 p.m., New
York City time,  on the Pricing Date,  the Closing Price per Reference  Share on
the  Pricing  Date,  except  that if  there  is not a  Trading  Day  immediately
preceding the Pricing Date or (where  pricing  occurs after 4:00 p.m.,  New York
City  time,  on the  Pricing  Date) if the  Pricing  Date is not a Trading  Day,
"Current  Market  Value"  means the market value per  Reference  Share as of the
Redemption Date as determined by a nationally recognized  independent investment
banking firm retained by the Company.

               A "Rollover Offering" means a refinancing of the PHONES by way of
either (i) a sale of the Reference  Shares or (ii) a sale of securities that are
priced by  reference to the  Reference  Shares,  in either  case,  by means of a
completed  public or private  offering or  offerings by the Company and which is
expected to yield net proceeds which are sufficient to pay the Redemption Amount
for all of the PHONES.  The Trustee will notify the Holders of the PHONES if the
Company elects to redeem the PHONES in connection  with a Rollover  Offering not
less than  thirty  (30) nor more than  sixty  (60)  Business  Days  prior to the
Redemption Date. The Company will also issue a press release prior to 4:00 p.m.,
New York City time, on the Business Day immediately prior to the day


                                       12


on which the Closing  Price of the  Reference  Shares is to be measured  for the
purpose of determining  the Current  Market Value in connection  with a Rollover
Offering.  Such notice shall state that the Company is firmly committed to price
the Rollover Offering,  shall specify the date on which the Rollover Offering is
to be priced  (including  whether the Rollover  Offering  shall be priced during
trading on the Pricing  Date or after the close of trading on the Pricing  Date)
and  consequently,  whether the Closing Price for the Reference  Shares by which
the Current  Market  Value shall be measured  shall be the Closing  Price on the
Trading Day  immediately  preceding the Pricing Date or the Closing Price on the
Pricing  Date.  The  Company  shall  provide  such  press  release  to  DTC  for
dissemination through the DTC broadcast facility.

               The "Closing Price" of any security on any date of  determination
means the closing sale price (or, if no closing sale price is reported, the last
reported sale price) of such  security  (regular way) on The Nasdaq Stock Market
on such date or, if such  security is not listed for trading on The Nasdaq Stock
Market on that date, as reported in the composite transactions for the principal
United States  securities  exchange on which such  security is so listed,  or if
such  security  is not  so  listed  on a  United  States  national  or  regional
securities  exchange,  the  last  quoted  bid  price  for such  security  in the
over-the-counter  market as reported by the National Quotation Bureau or similar
organization.  In the event that no such quotation is available for any day, the
Board of Directors shall be entitled to determine the Closing Price on the basis
of such quotations as it in good faith considers appropriate. To the extent that
trading of Reference  Shares normal way continues  past 4:00 p.m., New York City
time,  "Closing Price" shall be deemed to refer to the price at the time that is
then customary for  determining the Trading Day's index levels for stocks traded
on the primary  national  securities  exchange or automated  quotation system on
which the  Reference  Shares are then traded or quoted.  All  references to 4:00
p.m.,  New York City time,  in the  definition  of Current  Market  Value  shall
thereafter be deemed to refer to the then customary determination time.

               A "Trading  Day" is defined as a day on which the  security,  the
Closing Price of which is being determined, (i) is not suspended from trading on
any national or regional  securities exchange or association or over-the-counter
market  at the  close  of  business  and (ii) has  traded  at least  once on the
national or regional  securities  exchange or  association  or  over-the-counter
market that is the primary market for the trading of such security.

               In case of any Redemption  (other than a Redemption in connection
with a Rollover  Offering),  the Company shall give thirty (30)  Business  Days'
notice to the Trustee and to the  Holders of the PHONES of such  Redemption  and
the Redemption  Date,  such notice to include the issuance of a press release by
the Company,  which press  release  shall also be provided by the Company to DTC
for dissemination through the DTC


                                       13



broadcast facility.  On the fifth Business Day preceding the Redemption Date (or
as soon as practicable thereafter),  the Company shall provide to the Trustee an
Officer's  Certificate  and  prepare a press  release to be  provided to DTC for
dissemination through the DTC broadcast facility. Such Officer's Certificate and
press  release shall set forth on a per PHONES and an aggregate  basis,  (i) the
Redemption  Amount,  (ii) the Contingent  Principal  Amount as of the Redemption
Date,  (iii) the Current  Market  Value of the  Reference  Shares,  and (iv) the
Deferred  Basic  Interest  in  respect of such  Redemption.  The  Company  shall
irrevocably  deposit  with the Trustee  sufficient  funds to pay the  Redemption
Amount  on the  Redemption  Date.  Distributions  to be  paid on or  before  the
Redemption  Date  shall be payable  to the  Holders on the record  dates for the
related  dates  of  distribution.   In  addition,  if  any  Additional  Interest
Distribution  Date falls after the Redemption  Date, the Company shall make such
distribution on the Additional Interest Distribution Date.

               Once  notice of  Redemption  is given  and funds are  irrevocably
deposited,  interest  on the  PHONES  shall  cease to  accrue  on and  after the
Redemption Date and all rights of the Holders shall cease,  except for the right
of such Holders to receive the Redemption  Amount (but without  interest on such
Redemption Amount).

               If the Redemption Date is not a Business Day, then the Redemption
Amount  shall be payable on the next  Business  Day (and without any interest or
other payment in respect of any such delay).

               If the Company  improperly holds or refuses to pay any Redemption
Amount,  interest on the PHONES shall  continue to accrue at a rate equal to the
Basic Interest Rate then in effect,  even if such rate is lower than the rate in
effect when the amount owed  originally  accrued,  from the original  Redemption
Date (the "Original Redemption Date") to the actual date of payment (the "Actual
Redemption  Date"). In such case, the Actual Redemption Date shall be considered
the Redemption Date for purposes of calculating the Redemption Amount. The Final
Period  Distribution shall be deemed paid on the Original Redemption Date to the
extent paid as set forth in the definition of Final Period Distribution above.

6.  Reference Share Adjustments

               For  purposes   hereof,   "Reference   Company"  means  McLeodUSA
Incorporated,  a Delaware corporation  ("McLeodUSA"),  and any other issuer of a
Reference Share. A "Reference Share" means,  collectively (i) initially,  0.8772
share of  McLeodUSA's  Class A Common  Stock,  par value  $0.01 (the  "McLeodUSA
Stock");  (ii) and, after the date hereof,  each share or fraction of a share of
publicly traded equity  securities  received by a holder of a Reference Share in
respect of such Reference Share


                                       14


and, to the extent that the Reference Share remains outstanding after any of the
following events but without duplication, including the Reference Share, in each
case directly or as the result of successive applications of this paragraph upon
any  of the  following  events:  (A)  the  distribution  on or in  respect  of a
Reference Share in Reference  Shares;  (B) the  combination of Reference  Shares
into a  smaller  number  of  shares  or  other  units;  (C) the  subdivision  of
outstanding  shares or other units of Reference  Shares;  (D) the  conversion or
reclassification   of  Reference   Shares  by  issuance  or  exchange  of  other
securities;  (E) any  consolidation  or merger of a  Reference  Company,  or any
surviving  entity or  subsequent  surviving  entity of a  Reference  Company  (a
"Reference Company Successor"), with or into another entity (other than a merger
or  consolidation in which the Reference  Company is the continuing  corporation
and in which the Reference Company common stock outstanding immediately prior to
the merger or  consolidation  is not  exchanged  for cash,  securities  or other
property of the  Reference  Company or another  corporation);  (F) any statutory
exchange  of  securities  of the  Reference  Company  or any  Reference  Company
Successor with another  corporation  (other than in connection  with a merger or
acquisition  and other than a  statutory  exchange  of  securities  in which the
Reference  Company  is the  continuing  corporation  and in which the  Reference
Company common stock outstanding  immediately prior to the statutory exchange is
not exchanged for cash, securities or other property of the Reference Company or
another corporation);  or (G) any liquidation,  dissolution or winding up of the
Reference  Company or any Reference Company  Successor;  and (iii) any Reference
Share as adjusted by any Reference Share Offer Adjustment (as defined below).

               A  "Reference  Share  Offer"  means any tender  offer or exchange
offer  made for all or a portion of a class or series of  Reference  Shares of a
Reference Company. If a Reference Share Offer is made, the Company shall, at its
option,  either: (i) during the pendency of the Reference Share Offer,  increase
the Early  Exchange  Ratio to 100% of the  Reference  Shares and, if the Company
exercises  this  option  prior  to  February  15,  2003,  agree  to pay to  each
exchanging  Holder of a PHONES an amount  equal to the  Redemption  Premium that
would be owed to such Holder if the Company had  redeemed the PHONES on the date
of exchange; or (ii) make a Reference Share Offer Adjustment.

               A "Reference Share Offer Adjustment" means including as part of a
Reference Share each share of publicly traded equity securities,  if any, deemed
to be distributed on or in respect of a Reference  Share as Average  Transaction
Consideration  (as  defined  below)  less  the  Reference  Share   Proportionate
Reduction (as defined below).

               "Average  Transaction  Consideration"  deemed to be received by a
holder of one Reference  Share in a Reference  Share Offer shall be equal to (i)
the  aggregate  consideration  actually  paid or  distributed  to all holders of
Reference Shares that participated in the Reference Share Offer, divided by (ii)
the total number of Reference


                                       15


Shares  outstanding  immediately  prior to the expiration of the Reference Share
Offer and entitled to participate in such Reference Share Offer.

               A "Reference Share Proportionate Reduction" means a proportionate
reduction  in the  number  of  Reference  Shares  which are the  subject  of the
applicable  Reference Share Offer and  attributable to one PHONES  calculated in
accordance with the following formula:

                                  R=  X
                                     --
                                      N
where:

               R=   the fraction by which the number of Reference  Shares of the
                    class of Reference  Shares  subject to the  Reference  Share
                    Offer and attributable to one PHONES shall be reduced.

               X=   the  aggregate  number of  Reference  Shares of the class or
                    series of Reference  Shares  subject to the Reference  Share
                    Offer accepted in the Reference Share Offer.

               N=   the  aggregate  number of  Reference  Shares of the class of
                    series of Reference  Shares  subject to the Reference  Share
                    Offer outstanding immediately prior to the expiration of the
                    Reference Share Offer.

               If the Company elects to make a Reference Share Offer Adjustment,
the Company will  distribute  as  Additional  Interest  the Average  Transaction
Consideration  (other than Average  Transaction  Consideration  that is publicly
traded equity  securities  which will themselves  become  Reference  Shares as a
result of a  Reference  Share  Offer  Adjustment)  deemed to be  received on the
Reference Shares of the class or series subject to the Reference Share Offer and
attributable to each PHONES  immediately prior to giving effect to the Reference
Share Proportionate Reduction relating to such Reference Share Offer.

               If the Company elects to make a Reference Share Offer Adjustment,
and during the pendency of the  Reference  Share Offer another  Reference  Share
Offer is commenced in relation to the  Reference  Shares that are the subject of
the then  existing  Reference  Share Offer,  the Company may change its original
election  by  electing  to  increase  the  Early  Exchange  Ratio to 100% of the
Reference  Shares and agreeing to pay the other amounts  described  above during
the pendency of the new  Reference  Share Offer,  or the Company may continue to
elect to make a Reference Share Offer Adjustment. The


                                       16


Company  shall  similarly  be entitled to change its  election  for each further
Reference  Share Offer made during the pendency of any Reference Share Offer for
the same class of Reference  Shares.  For the purposes of these  adjustments,  a
material change to the terms of an existing Reference Share Offer will be deemed
to be a new Reference Share Offer.

               If the Company  elects to increase  the Early  Exchange  Ratio to
100% of the Reference  Shares in  connection  with a Reference  Share Offer,  no
Reference  Share Offer  Adjustment  shall be made and the Company may not change
such election if any further Reference Share Offer is made.

               The  Company  shall  give the  Trustee  notice  of the  Company's
election in the event of a Reference Share Offer. The Company shall also prepare
a press release and provide such press release to DTC for dissemination  through
the DTC broadcast facility. The Company shall give such notice no later than ten
(10) Business Days before the scheduled expiration of the Reference Share Offer.

7.  Acceleration of PHONES

               If an Event of Default with respect to the PHONES shall occur and
be  continuing,  the  Maturity  Amount of all  PHONES  then  outstanding  may be
declared,  or may become,  due and payable upon the conditions and in the manner
and with the effect provided in the Indenture.

8.  Calculations in Respect of the PHONES

               The  Company  shall be  responsible  for making all  calculations
required under the PHONES, including,  without limitation, the determination of:
(i) the  Contingent  Principal  Amount;  (ii) the  Current  Market  Value of the
Reference Shares;  (iii) the Exchange Market Value of the Reference Shares; (iv)
the Final Period  Distribution  on the PHONES;  (v) the fair market value of any
property  distributed  on the  Reference  Shares;  (vi) the Average  Transaction
Consideration; (vii) the composition of a Reference Share; (viii) the Redemption
Amount; (ix) the Maturity Amount; (x) Basic Interest;  (xi) Additional Interest;
and (xii) the amount of Accrued  Interest payable upon Redemption or at Maturity
of the PHONES.

               The Company shall make all such  calculations  in good faith and,
absent manifest error, such  calculations  shall be final and binding on Holders
of the PHONES.  The Company shall provide a schedule of such calculations to the
Trustee  and the Trustee  shall be  entitled  to rely upon the  accuracy of such
calculations without independent verification.


                                       17


9.  Amount Payable Upon Bankruptcy

               Upon  dissolution,  winding-up,  liquidation  or  reorganization,
whether voluntary or involuntary or in bankruptcy,  insolvency,  receivership or
other similar  proceedings in respect of the Company,  Holders of the PHONES may
be entitled to a claim  against  the Company  with  respect to each PHONES in an
amount equal to the higher of: (i) the Contingent  Principal  Amount or (ii) the
sum of  (1)  the  then  Current  Market  Value  (without  giving  effect  to the
provisions   relating  to  any  Rollover   Offering)  of  the  Reference  Shares
attributable  to  each  PHONES  and  (2)  any  unpaid  Deferred  Basic  Interest
(including  any Accrued  Interest)  plus, in the case of either (i) or (ii), the
Final  Period  Distribution  determined  as if the date of such  event  were the
Maturity Date of the PHONES.

10.  Discharge and Defeasance

               The Indenture  contains  provisions  for defeasance of the entire
indebtedness  of the PHONES upon  compliance  with certain  conditions set forth
therein, which provisions shall not apply to the PHONES.

11.  Amendment; Waiver

               The  Indenture  permits,   with  certain  exceptions  as  therein
provided,  the  amendment  thereof  and  the  modification  of  the  rights  and
obligations  of the Company and the  Guarantor  and the rights of the Holders of
the PHONES under the Indenture at any time by the Company, the Guarantor and the
Trustee  with the consent of the  Holders of a majority  in  Original  Principal
Amount of the  PHONES  at the time  outstanding.  The  Indenture  also  contains
provisions permitting the Holders of specified percentages in Original Principal
Amount of the PHONES at the time  outstanding,  on behalf of the  Holders of all
PHONES,  to waive  compliance  by the  Company  or the  Guarantor  with  certain
provisions of the  Indenture  and certain past Defaults  under the Indenture and
their  consequences.  Any such  consent or waiver by the  Holder of this  PHONES
shall be conclusive  and binding upon such Holder and upon all future Holders of
this PHONES and of any PHONES issued upon the  registration of transfer  thereof
or in  exchange  herefor  or in lieu  hereof,  whether or not  notation  of such
consent or waiver is made upon this PHONES.  Notwithstanding any other provision
of this PHONES or the Indenture, no supplemental indenture,  without the consent
of the Holders of each PHONES shall:

               (a)  reduce the amount of PHONES whose Holders must consent to an
                    amendment or waiver;


                                       18


               (b)  change  the  rate  or the  time  for  payment  of  interest,
                    including  Basic Interest,  Additional  Interest and amounts
                    relating to cash dividends on the Reference Shares;

               (c)  change the principal or the fixed maturity;

               (d)  waive a default  in the  payment  of  principal,  premium or
                    interest;

               (e)  make the PHONES payable in a different currency;

               (f)  make  any  change  in  the   provisions   of  the  Indenture
                    concerning  (i) waiver of existing  Defaults;  (ii) right of
                    Holders of PHONES to receive  payment;  or (iii)  amendments
                    and waivers with consent of Holders of PHONES;

               (g)  impair the right to institute  suit for the  enforcement  of
                    any payment on or after the stated  maturity of such payment
                    or, in the case of  Redemption,  on or after the  Redemption
                    Date; or

               (h)  modify or effect in any manner  adverse to the  Holders  the
                    terms  and   conditions  of  the   Guarantor's   obligations
                    regarding  due and punctual  payment of principal of, or any
                    premium or interest on the PHONES.

12. Payment

               No reference herein to the Indenture and provision of this PHONES
or of the Indenture  shall alter or impair the obligation of the Company and the
Guarantor,  which is absolute and  unconditional,  to pay the  principal of (and
premium,  if any) and interest on this PHONES at the times,  place and rate, and
in the coin or currency, herein prescribed.

13. Transfers

               As provided in the Indenture  and subject to certain  limitations
on transfer of this PHONES by DTC or its nominee, the transfer of this PHONES is
registrable by the Registrar,  upon surrender of this PHONES for registration of
transfer  at the office or agency of the Company or the  Guarantor,  as the case
may be, in Milwaukee,  Wisconsin  and the Borough of Manhattan,  The City of New
York, New York,  duly endorsed by, or  accompanied by the written  instrument of
transfer attached hereto duly executed by the Holder hereof or his attorney duly
authorized  in writing,  and  thereupon  one or more new PHONES,  of  authorized
denominations and for the same aggregate  principal  amount,  shall be issued to
the designated  transferee or  transferees.  The Registrar need not register the
transfer  of or  exchange  any PHONES for a period of 15 days before an Interest
Payment Date.


                                       19


               No  service  charge  shall be made for any such  registration  of
transfer or exchange of PHONES,  but the Company and the  Guarantor  may require
payment  of a sum  sufficient  to  cover  any tax or other  governmental  charge
payable in connection therewith.

               Prior to due  presentment  of this  PHONES  for  registration  of
transfer, the Company, the Guarantor,  the Trustee and any agent of the Company,
the  Guarantor  or the Trustee may treat the person in whose name this PHONES is
registered as the owner hereof for all  purposes,  whether or not this PHONES be
overdue, and none of the Company,  the Guarantor,  the Trustee or any such agent
shall be affected by notice to the contrary.

14. Persons Deemed Owners

               The registered  Holder of this PHONES may be treated as the owner
of it for all purposes.

15. Unclaimed Money

               If money for the payment of principal of, or premium,  if any, or
interest on, any PHONES remains  unclaimed for two years,  the Trustee or paying
agent shall pay the money back to the Company at its request unless an abandoned
property law designates another person. After any such payment, Holders entitled
to the money must look only to the Company and not to the Trustee for payment.

16. No Recourse Against Others

               A director,  officer,  employee or  stockholder,  as such, of the
Company or the Trustee shall not have any liability for any  obligations  of the
Company  under the PHONES or the Indenture or for any claim based on, in respect
of or by reason of such  obligations or their  creation.  By accepting a PHONES,
each Holder waives and releases all such  liability.  The waiver and release are
part of the consideration for the issue of the PHONES.

17. Registration Rights

               The Holder of this  PHONES is  entitled  to the  benefits  of the
Registration  Rights Agreement,  dated as of February 1, 2000 (the "Registration
Rights Agreement"), among the Company, the Guarantor and the Initial Purchaser.


                                       20


18. Representation and Warranty by Holders

               Each purchaser of PHONES,  by its  acquisition  thereof,  will be
deemed  to  have  acknowledged,  represented  to and  agreed  with  the  Initial
Purchaser, the Company and the Guarantor as follows:

               (1) Such purchaser  understands and acknowledges  that the PHONES
          have  not  been  registered  under  the  Securities  Act or any  other
          applicable   securities   laws,   are  being  offered  for  resale  in
          transactions  not requiring  registration  under the Securities Act or
          any other  securities laws including sales pursuant to Rule 144A under
          the  Securities  Act,  and  may  not be  offered,  sold  or  otherwise
          transferred except in compliance with the registration requirements of
          the Securities Act or any other applicable securities law, or pursuant
          to an exemption therefrom or in a transaction not subject thereto, and
          in each case in compliance  with the conditions for transfer set forth
          in paragraph (4) below.

               (2) Such purchaser is not an "affiliate"  (as defined in Rule 144
          under the Securities Act) of the Company and it is either:

                    (a) a QIB and is aware that any sale of PHONES to it will be
               made in  reliance on Rule 144A and such  acquisition  will be for
               its own account or for the account of another QIB with respect to
               which it exercises sole investment  discretion and to whom it has
               given  notice  that the PHONES are being sold in reliance on Rule
               144A; or

                    (b) an Institutional  Accredited Investor and, if the PHONES
               are  to  be  purchased  for  one  or  more  accounts   ("investor
               accounts")  for which it is acting as  fiduciary  or agent,  each
               such investor account is an Institutional  Accredited Investor on
               a like basis; in the normal course of its business, it invests in
               or purchases  securities similar to the PHONES and such purchaser
               has such  knowledge  and  experience  in  financial  and business
               matters that it is capable of evaluating  the merits and risks of
               purchasing any of the PHONES and it is aware that it (or any such
               investor account) may be required to bear the economic risk of an
               investment in the PHONES for an indefinite  period of time and it
               (or  such  investor  account)  is able to bear  such  risk for an
               indefinite  period  and such  purchaser  has  agreed to deliver a
               letter  substantially  in the  form of  Exhibit  D to the  Second
               Supplemental Indenture to the Company.

               (3) Such  purchaser  acknowledges  that none of the Company,  the
          Guarantor or the Initial  Purchaser,  or any person  representing  the
          Company,  the


                                       21


          Guarantor or the Initial Purchaser,  has made any representation to it
          with respect to the Company,  the Guarantor or the offering or sale of
          any  PHONES  other  than the  information  contained  in the  Offering
          Memorandum,  dated January 26, 2000, relating to the PHONES, which has
          been  delivered  to it and upon  which  such  purchaser  is relying in
          making  its   investment   decision   with   respect  to  the  PHONES.
          Accordingly,  such purchaser  acknowledges  that no  representation or
          warranty  is made  by the  Initial  Purchaser  as to the  accuracy  or
          completeness of such materials.  Such purchaser has had access to such
          financial and other information  concerning the Company, the Guarantor
          and the PHONES  (and the  Guarantees)  as it has deemed  necessary  in
          connection with its decision to purchase any of the PHONES,  including
          an  opportunity to ask questions of and request  information  from the
          Initial Purchaser, the Company and the Guarantor.

               (4) Such  purchaser is purchasing the PHONES for its own account,
          or for one or more  investor  accounts  for  which it is  acting  as a
          fiduciary or agent, in each case for  investment,  and not with a view
          to, or for offer or sale in connection with, any distribution  thereof
          in violation of the Securities Act,  subject to any requirement of law
          that the  disposition of its property or the property of such investor
          account or  accounts be at all times  within its or their  control and
          subject to its or their ability to resell such PHONES pursuant to Rule
          144A or any exemption from registration available under the Securities
          Act or pursuant to a  registration  statement  which has been declared
          effective under the Securities  Act. Such purchaser  agrees on its own
          behalf  and  on  behalf  of  any  investor  account  for  which  it is
          purchasing the PHONES, and each subsequent holder of the PHONES by its
          acceptance  thereof  will be deemed to  agree,  not to offer,  sell or
          otherwise transfer the PHONES prior to (x) the date which is two years
          (or such shorter  period of time as permitted by Rule 144(k) under the
          Securities  Act) after the later of the date of original  issue of the
          PHONES  and  the  last  date  on  which  the  Company  or  any  of its
          "affiliates" (as defined in Rule 144 under the Securities Act) was the
          owner of the PHONES  (or any  predecessor  thereto)  or (y) such later
          date,  if any,  as may be  required  by  applicable  law (the  "Resale
          Restriction Termination Date"), unless such sale, offer or transfer is
          made (a) to the  Company,  (b)  pursuant to a  registration  statement
          which has been declared effective under the Securities Act, (c) for so
          long as the PHONES are eligible for resale  pursuant to Rule 144A to a
          person it  reasonably  believes  is a QIB that  purchases  for its own
          account or for the  account of a QIB,  in each case to whom  notice is
          given that the transfer is being made in reliance on Rule 144A, (d) to
          an Institutional  Accredited Investor that is acquiring the PHONES for
          its own account or for the account of such an Institutional Accredited
          Investor for investment  purposes and not with a view to, or for offer
          or sale in  connection  with,  any  distribution  in  violation of the
          Securities


                                       22


          Act  or (e)  pursuant  to  any  other  available  exemption  from  the
          registration  requirements of the Securities  Act,  subject in each of
          the foregoing  cases to any requirement of law that the disposition of
          its property or the property of such  investor  account or accounts be
          at all times within its or their  control and to  compliance  with any
          applicable  state or other  securities laws. If any resale or transfer
          of the  PHONES is  proposed  to be made  pursuant  to clause (d) above
          prior to the Resale Restriction Termination Date, the transferor shall
          deliver  a letter  from the  transferee  substantially  in the form of
          Exhibit  D to the  Indenture  to the  Company  and  the  Trustee.  The
          foregoing  restrictions  on resale  will not apply  subsequent  to the
          Resale   Restriction   Termination  Date.  Each  purchaser  of  PHONES
          acknowledges  that the Company,  the Guarantor and the Trustee reserve
          the right prior to any offer,  sale or other  transfer of PHONES prior
          to the Resale Restriction  Termination Date pursuant to clauses (d) or
          (e),  above,  to  require  the  delivery  of an  opinion  of  counsel,
          certifications  and/or other information  satisfactory to them and the
          Trustee.  Each purchaser of PHONES  acknowledges that each PHONES will
          contain a legend  substantially in the form on the face of this PHONES
          unless otherwise agreed by the Company, the Guarantor and the Trustee.

               (5) Such purchaser  acknowledges that the Company, the Guarantor,
          the Initial Purchaser, the Trustee and others will rely upon the truth
          and accuracy of the  foregoing  acknowledgments,  representations  and
          agreements   and   agree   that,   if  any  of  the   acknowledgments,
          representations, warranties and agreements deemed to have been made by
          its purchase of the notes are no longer  accurate,  it shall  promptly
          notify the Initial Purchaser. If such purchaser is acquiring any notes
          as a  fiduciary  or  agent  for  one or  more  investor  accounts,  it
          represents that it has sole investment discretion with respect to each
          such   account   and  it  has  full   power  to  make  the   foregoing
          acknowledgments, representations and agreements on behalf of each such
          account  and that each such  investor  account is eligible to purchase
          the PHONES.

               (6) Such purchaser  acknowledges  that the Trustee,  the transfer
          agent  and  the   registrar   will  not  be  required  to  accept  for
          registration  of  transfer  any PHONES  acquired  by it,  except  upon
          presentation  of evidence  satisfactory to the Company and the Trustee
          that the restrictions set forth above have been complied with.

               (7) Such purchaser  acknowledges that the foregoing  restrictions
          apply to holders of beneficial interests in the PHONES, as well as the
          holders of the PHONES.


                                       23


19.  Sinking Fund

               The  PHONES  do  not  have  the  benefit  of  any  sinking   fund
obligations.

20.  Indenture

               The Company shall furnish to any Holder of record of PHONES, upon
written request and without charge, a copy of the Indenture.

21.  Governing Law

               The  Indenture  and this  PHONES  each shall be  governed  by and
construed in accordance  with the laws of the State of Wisconsin  without regard
to principles of conflicts of law.

22.  Authentication

               Unless the certificate of authentication hereon has been executed
by the Trustee by manual  signature,  this  PHONES  shall not be entitled to any
benefit under the Indenture or be valid or obligatory for any purpose.



                                       24


               In Witness  Whereof,  Alliant Energy  Resources,  Inc. has caused
this PHONES to be signed in its corporate name by the facsimile signature of two
of its  officers  thereonto  duly  authorized  and has caused a facsimile of its
corporate seal to be affixed hereto or imprinted or otherwise reproduced hereon.

                                         ALLIANT ENERGY RESOURCES, INC.
ATTEST:


By: __________________________________   By: __________________________________
      Name:                                    Name:
      Title:                                   Title:




                                       25


               FOR  VALUE  RECEIVED,   the  Guarantor,   hereby  unconditionally
guarantees to the Holder of the Security  upon which this  Guarantee is endorsed
the due and punctual payment of the principal,  of premium,  if any, or interest
on said Security, when and as the same shall be become due and payable,  whether
at maturity, upon redemption or otherwise, according to the terms thereof and of
the Indenture referred to therein.

               The  Guarantor  agrees to  determine,  at least one  business day
prior to the date upon which a payment of  principal,  of  premium,  if any,  or
interest on said Security is due and payable,  whether the Company has available
the funds to make such payment as the same shall become due and payable. In case
of the failure of the Company punctually to pay any such principal,  premium, if
any, or interest,  the  Guarantor  hereby agrees to cause any such payment to be
made  punctually  when and as the same shall become due and payable,  whether at
maturity, upon redemption or otherwise,  and as if such payment were made by the
Company.

               The Guarantor hereby agrees that its obligations  hereunder shall
be  unconditional,  irrevocable  and  absolute,  irrespective  of the  validity,
regularity or enforceability of said Security or said Indenture,  the absence of
any  action to  enforce  the same,  any  waiver or consent by the Holder of said
Security with respect to any  provisions  thereof,  the recovery of any judgment
against the Company or any action to enforce the same or any other  circumstance
which might otherwise  constitute a legal or equitable discharge or defense of a
guarantor.  The  Guarantor  hereby  waives  diligence,  presentment,  demand  of
payment,  filing of claims with a court in the event of merger or  bankruptcy of
the  Company,  any right to require a  proceeding  first  against  the  Company,
protest  or notice  with  respect to said  Security  or  indebtedness  evidenced
thereby,  and all demands  whatsoever and covenants that this Guarantee will not
be discharged  except by complete  performance of the  obligations  contained in
said Security and in this Guarantee.

               The Guarantor  shall be subrogated to all rights of the Holder of
said  Security  against  the  Company  in  respect  to any  amounts  paid by the
Guarantor pursuant to the provisions of this Guarantee;  provided, however, that
the  Guarantor  shall not,  without  the  consent  of the  Holders of all of the
Securities then  outstanding,  be entitled to enforce or to receive any payments
arising out of or based upon such right of  subrogation  until the  principal of
and premium, if any, and interest on all Securities shall have been paid in full
or  payment  thereof  shall  have  been  provided  for in  accordance  with said
Indenture.

               Notwithstanding  anything to the contrary  contained  herein,  if
following any payment of principal or interest by the Company on the  Securities
to the Holders of the


                                       26


Securities  it is  determined  by a  final  decision  of a  court  of  competent
jurisdiction  that such  payment  shall be avoided  by a trustee  in  bankruptcy
(including any debtor-in-possession) as a preference under 11 U.S.C. Section 547
and such payment is paid by such Holder to such trustee in bankruptcy,  then and
to the extent of such repayment the obligations of the Guarantor hereunder shall
remain in full force and effect.

               This  Guarantee  shall not be valid or become  obligatory for any
purpose with respect to a Security until a certificate of authentication on such
Security shall have been signed by the Trustee (or the authenticating agent).

               This  Guarantee  shall be  governed  by the laws of the  State of
Wisconsin.

               IN WITNESS  WHEREOF,  ALLIANT ENERGY  CORPORATION has caused this
Guarantee  to be signed in its  corporate  name by the  signature  of two of its
officers  thereunto  duly  authorized  and has caused its  corporate  seal to be
affixed hereto or imprinted or otherwise reproduced hereon.


                                         ALLIANT ENERGY CORPORATION,
                                         as Guarantor
ATTEST:


By: _________ ________________________   By: __________________________________
      Name:                                    Name:
      Title:                                   Title:



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                      TRUSTEE CERTIFICATE OF AUTHENTICATION


     This is one of the PHONES described in the within-named Indenture.


                                         FIRSTAR BANK, N.A.,
                                         as Trustee



                                         By: ________________________________
                                               Name:
                                               Title:





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