PROMISSORY NOTE

Exhibit 10.2

PROMISSORY NOTE

References in the boxes above are for Lender’s use only and do not limit the applicability of this document to any particular loan or item. Any item above containing “***” has been omitted due to text length limitations.

PROMISE TO PAY.  TOWER TECH SYSTEMS INC (“Borrower”) promises to pay to GREAT WESTERN BANK (“Lender”), or order, in lawful money of the United States of America, the principal amount of Ten Million & 00/100 Dollars ($10,000,000.00) or so much as may be outstanding, together with interest on the unpaid outstanding principal balance of each advance, calculated as described in the “INTEREST CALCULATION METHOD” paragraph using an interest rate of 7.500% per annum based on a year of 360 days. Interest shall be calculated from the date of each advance until repayment of each advance. The interest rate may change under the terms and conditions of the “INTEREST AFTER DEFAULT” section.

PAYMENT. Borrower will pay this loan in one payment of all outstanding principal plus all accrued unpaid interest on January 5, 2010. In addition, Borrower will pay regular monthly payments of all accrued unpaid interest due as of each payment date, beginning June 5, 2009, with all subsequent interest payments to be due on the same day of each month after that. Unless otherwise agreed or required by applicable law, payments will be applied first to any accrued unpaid interest; then to principal; then to any unpaid collection costs; and then to any late charges. Borrower will pay Lender at Lender’s address shown above or at such other place as Lender may designate in writing.

INTEREST CALCULATION METHOD. Interest on this Note is computed on a 365/360 basis; that is, by applying the ratio of the interest rate over a year of 360 days, multiplied by the outstanding principal balance, multiplied by the actual number of days the principal balance is outstanding. All interest payable under this Note is computed using this method.

PREPAYMENT; MINIMUM INTEREST CHARGE.   Borrower agrees that all loan fees and other prepaid finance charges are earned fully as of the date of the loan and will not be subject to refund upon early payment (whether voluntary or as a result of default), except as otherwise required by law.  In any event, even upon full prepayment of this Note, Borrower understands that Lender is entitled to a minimum interest charge of $75.00 .  Other than Borrower’s obligation to pay any minimum interest charge, Borrower may pay without penalty all or a portion of the amount owed earlier than it is due. Early payments will not, unless agreed to by Lender in writing, relieve Borrower of Borrower’s obligation to continue to make payments of accrued unpaid interest.  Rather, early payments will reduce the principal balance due.  Borrower agrees not to send Lender payments marked “paid in full”, “without recourse”, or similar language.  If Borrower sends such a payment, Lender may accept it without losing any of Lender’s rights under this Note, and Borrower will remain obligated to pay any further amount owed to Lender. All written communications concerning disputed amounts, including any check or other payment instrument that indicates that the payment constitutes “payment in full” of the amount owed or that is tendered with other conditions or limitations or as full satisfaction of a disputed amount must be mailed or delivered to:  GREAT WESTERN BANK, 35 1st Ave NE Watertown, SD 57201.

LATE CHARGE. If a payment is 10 days or more late, Borrower will be charged 2.000% of the regularly scheduled payment or $25.00, whichever is greater.

INTEREST AFTER DEFAULT. Upon default, including failure to pay upon final maturity, the interest rate on this Note shall be increased to 20.000% per annum based on a year of 360 days.  However, in no event will the interest rate exceed the maximum interest rate limitations under applicable law.

DEFAULT.   Each of the following shall constitute an event of default (“Event of Default”) under this Note:

Payment Default. Borrower fails to make any payment when due under this Note.

Other Defaults. Borrower fails to comply with or to perform any other term, obligation, covenant or condition contained in this Note or in any of the related documents or to comply with or to perform any term, obligation, covenant or condition contained in any other agreement between Lender and Borrower.

False Statements. Any warranty, representation or statement made or furnished to Lender by Borrower or on Borrower’s behalf under this Note or the related documents is false or misleading in any material respect, either now or at the time made or furnished or becomes false or misleading at any time thereafter.

Insolvency. The dissolution or termination of Borrower’s existence as a going business, the insolvency of Borrower