"William Andersen" wrote in
:

I don't know about a car FM, but I have two Marine VHF-FM radios that
use one antenna.


An inherently terrible idea for safety at sea.

The weakest, most exposed link in your VHF system has no backup.

So, there you are sinking off Drum Island with ONE dead antenna and two
perfectly good VHF radios unable to call for help from that ship 8 miles
away you can see the top of.

TWO radios should have TWO antenna fed by TWO SEPARATE FEEDLINES and TWO
POWER SOURCES, if possible, and it is. REDUNDANCY is why spacecraft
operate way beyond their expected life.

Please put up even a little Metz Manta 6 on a handrail mount. Do it for
the children, please?