EXHIBIT A AGREEMENT OF REPORTING PERSONS Each of the undersigned hereby agrees that the Amendment No. 1 to Schedule 13G filed on the date hereof with respect to the shares of Common Stock of Repeater Technologies, Inc. has been filed on behalf of the...

                                                                   EXHIBIT 99(A)

                                                                   Page 16 of 22

                                    EXHIBIT A

AGREEMENT OF REPORTING PERSONS

     Each of the undersigned hereby agrees that the Amendment No. 1 to Schedule
13G filed on the date hereof with respect to the shares of Common Stock of
Repeater Technologies, Inc. has been filed on behalf of the undersigned.

SIGNATURE:

     Dated: February 7, 2003

Entities:

Oak Investment Partners VI, Limited Partnership
Oak Associates VI, LLC
Oak VI Affiliates Fund, Limited Partnership
Oak VI Affiliates, LLC
Oak Management Corporation

                                             By:     /s/ Xxxxxx X. Xxxxxxxxxx
                                                  ------------------------------
                                                      Xxxxxx X. Xxxxxxxxxx, as
                                                      General Partner or
                                                      Managing Member or as
                                                      Attorney-in-fact for the
                                                      above-listed entities

Individuals:

Bandel X. Xxxxxx
Xxxxxx X. Xxxxxxxxx
Xxxxxx X. Xxxxxxxxxx
Xxxxxxx X. Xxxxxx
Xxx X. Xxxxxx

                                             By:     /s/ Xxxxxx X. Xxxxxxxxxx
                                                  ------------------------------
                                                      Xxxxxx X. Xxxxxxxxxx,
                                                      Individually and as
                                                      Attorney-in-fact for the
                                                      above-listed individuals