That's not a good way to measure whether or not the coax is terminated
properly. I just inspected an antique where the antenna was properly
mounted on a sufficiently big ground plane, but the coax braid wasn't even
connected to the ground plane at the antenna end. You might just a well
have run Romex as coax if that's the case. And, of course, there WAS
continuity to ground as the coax WAS terminated at the radio end to the
airframe.

THe question was whether BOTH antennas or coax could be "bad". I can argue
that if the fellow who made the plane didn't know how to assemble a
connector properly the odds of him screwing up BOTH the coax cables in the
same way are quite good.

THere is no substitute for a good mechanical inspection of the coax
connections at both the radio AND antenna ends.

I didn't notice whether or not the OP said that he borrowed a known good
headset, since that's the one thing that is common to both rigs.

Jim





You should be ok with an aluminum RV as long as the coax outer conductor
to the skin reads a short on an ohmmeter.