All antennas – COM, Transponder, GPS and ADSB get replaced in this avionics upgrade. The tough one to remove and install is the COM. It has an inside mounting plate, (4) small washers and nuts, that you have to screw-on through the access holes next to the antenna, only by feel without seeing. You will need a mirror inspector and you will drop the washer/nuts a few times. It just takes a lot of patience.
