Don ...

Both the graphite grease and the copper grease we use on spark plugs to make
them easier to remove are electrically conductive as well as thermally
conductive. HOWEVER, no such grease is needed (or wanted) on the COM
antenna(s).

On the other hand, I generally put a VERY thin film (almost a whisper) of
Dow Corning silicone grease (NOT SILICONE SEAL) on both sides of the rubber
gasket to keep rainwater out of the aircraft.

Jim



It's probably just my ignorance, but the only conductive grease I've
ever encountered in electronics is the stuff you used to use between
the bottom of a power transistor in a TO3 can and the mica washer.
(Or was it between the washer and the heat sink?) It was thermally,
rather than electrically, conductive.

Don