Exhibit 31.1

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

I, Kenneth A. Chymiak, certify that:

1.     I have reviewed this quarterly report on Form 10-Q of ADDvantage
    Technologies Group, Inc.;

2.     Based on my knowledge, this 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 registrant 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 registrant 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 registrant,
       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 registrant's disclosure controls and
       procedures and presented in this report my conclusions about the
       effectiveness of the disclosure controls and procedures, as of the end
       of the period covered by this report based on such evaluation; and

    c. Disclosed in this report any change in the registrant's internal control
       over financial reporting that occurred during the registrant's most
       recent fiscal quarter (the registrant's fourth fiscal quarter in the
       case of an annual report) that has materially affected, or is reasonably
       likely to materially affect, the registrant'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 registrant's auditors and the audit
    committee of the registrant'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 registrant's ability to
       record, process, summarize and report financial information; and

    b. Any fraud, whether or not material, that involves management or other
       employees who have a significant role in the registrant's internal
       control over financial reporting.


Date: February 13, 2006


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