My -7A has the transponder antenna on the right, just forward of the spar, protected by the gear weldment. The ADS-B in antenna is on the opposite side.
Comm antenna is under the copilot seat, second bay in, as far aft as I could put it and still easily buck the rivets.
I have no issues with communication but occasionally lose ADS-B in signals, which I think are more related to on-going issues with the Dynon/UAvionics receiver.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army