I don't know about a car FM, but I have two Marine VHF-FM radios that use
one antenna.
I have an
a.. SHAKESPEARE ELECTRON
a.. Automatic Two-Way Antenna Selector
a.. Only $84.99 USD
When a radio mic is keyed, the other radio is isolated from the antenna.
Doesn't matter which radio is used, the other is automatically protected.
I've had it for several years and both radios work fine.
When a mic is not keyed, both radios receive. That's convenient for me as I
can scan several channels on one radio and remain on another channel on the
other radio.

" Mika" wrote in message
...

Currently have a car FM with its own antenna just above deck. Wish to
use my mast-mounted marine VHF antenna for receiving broadcast FM as
well. There are many devices available what sort of split the
antenna cable to VHF and FM. Do these in practice provide enough
separation so that I would not "fry" my FM receiver should I transmit
on marine VHF while broadcast FM radio is swhitched on? 25 watts to
receiver could do some damage...

Mika






--

A bad day on the water is better than a great day on land.

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