You will want to run a wire (12 or 14 ga.) to an earth ground rod that
is down some 10 feet. And connect that to the ground connection on your
radio..

You will want to run a separate 12 volt power supply to feed your radio
and make sure that is also connected to its own earth ground rod..

You will want to feed your 12 volt power supply via your house wiring
that has a 3-prong plug type outlet..

You will want to also have your fusebox be connected to a earth ground
rod too.

Try these items and that should solve some of your problems..


73's
Roger
West Michigan