Exhibit 31.1

   CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CFO PURSUANT TO SECTION 302 OF
                         THE SARBANES-OXLEY ACT OF 2002

I, Kenneth A. Chymiak, certify that:

1.   I have reviewed this annual report on Form 10-K of ADDvantage Technologies
     Group, Inc, (the "Company");

2.   Based on my knowledge, this annual report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the Company as of, and for, the periods presented in this report;

4.   I am responsible for establishing and maintaining disclosure controls and
     procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15-(e)) for
     the Company and have;

     a.   Designed such disclosure controls and procedures, or caused such
          disclosure controls and procedures to be designed under my
          supervision, to ensure that material information relating to the
          Company, including its consolidated subsidiaries, is made known to me
          by others within those entities, particularly during the period in
          which this report is being prepared;

     b.   Evaluated the effectiveness of the Company's disclosure controls and
          procedures and presented in this report my conclusions about the
          effectiveness of the disclosure controls and procedures based on such
          evaluation; and

     c.   Disclosed in this report any change in the Company's internal control
          over financial reporting during the Company's most recent fiscal
          quarter (the Company's fourth fiscal quarter in the case of an annual
          report) that has materially affected, or is reasonably likely to
          materially affect, the Company's internal control over financial
          reporting; and

5.   I have disclosed, based on my most recent evaluation of internal control
     over financial reporting, to the Company's auditors and the audit committee
     of the Company's board of directors (or persons performing the equivalent
     functions):

     a.   All significant deficiencies and material weaknesses in the design or
          operation of internal control over financial reporting which are
          reasonably likely to adversely affect the Company's ability to record,
          process, summarize and report financial information; and
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     b.   Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the Company's internal
          control over financial reporting.

Date: December 22, 2004


                       /s/ Kenneth A. Chymiak
                       _______________________________________
                       Kenneth A. Chymiak
                       Chief Executive Officer and Chief Financial Officer