Another question...I have my GMRS antenna mounted on my roof rack on my Jeep JL. The roof of the Jeep is fiberglass. The roof rack crossbars are aluminum. I have the antenna mounted to the crossbar on an approximately 8" long 3" wide 1/4" thick piece of steel. Should I run a ground wire from the steel mount to the frame of the Jeep? I know with CBs this helps but not sure about GMRS. Thanks