No. PW _________                                                 30,000 Warrants



                            VOID AFTER March 31, 2003

                       WARRANT CERTIFICATE FOR PURCHASE OF
                                  MIRENCO, INC.
                             SHARES OF COMMON STOCK


THIS WARRANT AND ANY SHARES OF COMMON STOCK  ISSUABLE UPON ITS EXERCISE HAVE NOT
BEEN  REGISTERED  UNDER THE  SECURITIES  ACT OF 1933 AND MAY NOT BE  TRANSFERRED
UNTIL (1) A  REGISTRATION  STATEMENT  UNDER THE SECURITIES ACT OF 1933 (THE ACT)
SHALL HAVE BECOME EFFECTIVE WITH RESPECT THERETO OR (2) RECEIPT BY THE ISSUER OF
AN OPINION OF COUNSEL  REASONABLY  SATISFACTORY TO THE ISSUER TO THE EFFECT THAT
REGISTRATION  UNDER THE ACT IS NOT  REQUIRED IN  CONNECTION  WITH SUCH  PROPOSED
TRANSFER NOR IS SUCH TRANSFER IN VIOLATION OF ANY  APPLICABLE  STATE  SECURITIES
LAWS.


     This  certifies  that FOR VALUE  RECEIVED,  Carl N.  Duncan  or  registered
assigns  (the  "Registered  Holder")  is the  owner of the  number  of  Warrants
("Warrants")  specified above.  Each Warrant  initially  entitles the Registered
Holder  to  purchase,  subject  to the terms  and  conditions  set forth in this
Certificate,  one  fully  paid and  nonassessable  Share of  Common  Stock  (the
"Shares") for each Warrant of Mirenco, Inc., an Iowa corporation (the "Company")
at any time  commencing  March  31,  2000 and prior to the  Expiration  Date (as
hereinafter  defined),  upon the  presentation  and  surrender  of this  Warrant
Certificate with the Subscription  Form on the reverse hereof duly executed,  at
the  corporate  office of the  Company  as the  initial  Warrant  Agent,  or its
successor,  accompanied  by payment  of an amount  equal to $0.01 for each Share
(the  "Purchase  Price") in lawful money of the United States of America in cash
or by official bank or certified check made payable to Mirenco, Inc.

     Each  Warrant  represented  hereby  is  exercisable  at the  option  of the
Registered  Holder,  but no fractional Shares will be issued. In the case of the
exercise of less than all the Warrants  represented  hereby,  the Company  shall
cancel this Warrant  Certificate upon the surrender hereof and shall execute and
deliver new Warrant  Certificate(s) of like tenor, which the Warrant Agent shall
countersign, for the balance of such Warrants.

     The term Expiration Date shall mean 5:00 P.M. Eastern Standard Time ("EST")
on March 31, 2003. If such date shall in the State of Iowa be a holiday or a day
on which the banks are authorized to close,  then the Expiration Date shall mean
5:00 P.M. EST the next following day which in the State of Iowa is not a holiday
or a day on which  banks  are  authorized  to close.  The  Company  may,  at its
election, extend the Expiration Date.

     This Warrant Certificate is exchangeable,  upon the surrender hereof by the
Registered  Holder at the corporate office of the Warrant Agent, for new Warrant
Certificate(s) of like tenor representing an equal aggregate number of Warrants,
each of such new Warrant  Certificate(s) to represent such number of Warrants as
shall be designated  by such  Registered  Holder at the time of such  surrender.
Upon due  presentment  with  any tax or other  governmental  charge  imposed  in
connection  therewith,  for registration of transfer of this Warrant Certificate
at such  office,  new Warrant  Certificate(s)  representing  an equal  aggregate
number of Warrants will be issued to the transferee in exchange therefor.

     Prior  to  the  exercise  of  any  Warrant  represented  hereby,  unless  a
Shareholder of the underlying Shares independent of this Warrant, the Registered
Holder  shall  not be  entitled  to any of the  rights of a  Shareholder  of the
Company,  including,  without  limitation,  the  right  to  vote  or to  receive
dividends  or other  distributions,  and shall not be  entitled  to receive  any
notice of any proceedings of the Company.

     Prior to due presentment for registration of transfer  hereof,  the Company
may deem and treat for all purposes the Registered  Holder as the absolute owner
hereof and of each Warrant represented hereby  (notwithstanding any notations of
ownership or writing hereon made by anyone other than a duly authorized  officer
of the Company) and shall not be affected by any notice to the contrary.



     This Warrant will automatically  convert into a like number of new warrants
under certain circumstances in the event the Company completes an initial public
offering of its  securities  having the terms and  conditions  specified in this
Warrant Certificate.
     This Warrant  Certificate  shall be governed by and construed in accordance
with the laws of the State of Iowa.

     IN WITNESS WHEREOF,  the Company has caused this Warrant  Certificate to be
duly  executed  on  March  31,  2000,  manually  or in  facsimile  by two of the
Company's  officers  thereunto duly  authorized and a facsimile of its corporate
seal to be imprinted hereon.


MIRENCO, INC.



By: /s/ Dwayne Fosseen                                          [Corporate Seal]
- ----------------------
   Dwayne Fosseen, President



                                SUBSCRIPTION FORM

                     To Be Executed by the Registered Holder
                          in Order to Exercise Warrants


         The undersigned Registered Holder hereby irrevocably elects to exercise
Warrants  represented  by this Warrant  Certificate  and purchase the securities
issuable upon the exercise of such Warrants,  and requests that certificates for
such securities shall be issued in the name of (and be delivered to):

            PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER
                                 (if applicable)

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

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

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

                        --------------------------------
                     [Please print or type name and address]


and, if such number of Warrants shall not be all the Warrants  evidenced by this
Warrant  Certificate,  that a new  Warrant  Certificate  for the balance of such
Warrants be registered in the name of, and delivered to, the  Registered  Holder
at the address stated below.

         The undersigned  represents that the exercise of the within Warrant was
not solicited by a member of the National  Association  of  Securities  Dealers,
Inc. (the "NASD").




Dated:   ________________________________

By:      ________________________________



Signature Guaranteed


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THE SIGNATURE TO THIS  SUBSCRIPTION  FORM MUST CORRESPOND TO THE NAME AS WRITTEN
UPON  THE  FACE  OF  THIS  WARRANT  CERTIFICATE  IN  EVERY  PARTICULAR,  WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER,  AND MUST BE GUARANTEED BY A
COMMERCIAL  BANK OR TRUST  COMPANY OR A MEMBER FIRM OF THE  AMERICAN,  NEW YORK,
PACIFIC OR MIDWEST STOCK EXCHANGES.




                                   ASSIGNMENT


                     To Be Executed by the Registered Holder
                           in Order to Assign Warrants


FOR  VALUE  RECEIVED,  _________________________________________________  hereby
sells, assigns and transfers unto

            PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER
                                 (if applicable)

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

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

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

                        --------------------------------
                     [Please print or type name and address]


_______________________ of the Warrants represented by this Warrant Certificate,
and       hereby        irrevocably        constitutes        and       appoints
______________________________________________  his lawful  Attorney-in-Fact  to
transfer this Warrant  Certificate on the books of the Company,  with full power
of substitution in the premises.


Dated:   ________________________________


         --------------------------------
By:

Signature Guaranteed


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THE  SIGNATURE TO THIS  ASSIGNMENT  FORM MUST  CORRESPOND TO THE NAME AS WRITTEN
UPON  THE  FACE  OF  THIS  WARRANT  CERTIFICATE  IN  EVERY  PARTICULAR,  WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATSOEVER,  AND MUST BE GUARANTEED BY A
COMMERCIAL  BANK OR TRUST  COMPANY OR A MEMBER FIRM OF THE  AMERICAN,  NEW YORK,
PACIFIC OR MIDWEST STOCK EXCHANGES.