"Franky" wrote in
oups.com:

Can anyone suggest and pros and cons of this kind of setup and suggest
any better setups


Before you spend a dime on this project, connect just the center "hot" pin
of your receiver to the chainplate inside the boat and the radio should be
already grounded to the battery ground system just by hooking it up.

You'll be amazed at the signals on the shrouds, which aren't grounded in
most boats I've ever seen.

Our Icom M802 uses a separate receiving antenna for the GMDSS/DSC channels,
scanning them. I'm running a piece of RG-58 coax over to a convenient bolt
to the starboard handrail. The coax forms a Faraday Shield to stop the
receiver from hearing so much RF noise back at the nav station where the
noisy damned NMEA bus makes a racket. At the bolt, the shield is simply
left open, not connected to anything, while the center conductor connects
to a ring terminal on the bolt to the handrail post. The handrails on an
Amel are all welded stainless steel all the way around and all connected
together for this antenna. Works great. The handrail is not grounded to
the boat's battery negative or engine block.

Any long metal object not connected to the ground reference the receiver
uses is a good antenna.

Oh, almost forgot to suggest you get your nice receiver a lightning
arrester for any of these antennas. There's some nasty static discharges
that can destroy the receiver from St Elmo's Fire....or a direct hit, of
course.

Shh...don't tell anyone....the lightning protectors your cable TV company
use work just great for receiver protection! Don't use them on
transmitters or transceivers. If you're real nice to the cable guy, he'll
give you a few. He has thousands on his truck...(c;
Get the ones with the heavy wire terminal on the side to hook to ground.
http://www.comm-omni.com/tii/tiicoax.htm
(Ignore the 5 Mhz low end rating. They are DC connected from end to end
and have a gas tube inside that arcs when there's a surge. 5 Mhz is
cablespeak for "it'll work if you have internet broadband on your system".)

--
Larry