Transponder Antenna Thought

Coupling multiple antennas to the same transmitter will likely create
an impedance mismatch, which will introduce standing waves and reduce
power output (kind of negating the original intent). This would have to
be properly engineered by the transponder manufacturer to be a legal
installation. I would direct the question to them, but I expect the
answere will be to stick with a single antenna.

Tom Seim