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The said metal plate will NOT be a good RF ground. It would perform similar to slapping a mag mount on a cookie sheet. Ideally, your vehicle would be one continuous piece of metal, no hinges or gaps or un-welded joints. Electrical ground and RF ground are not the same, thats why you need to ground your doors and hood to the body using ground straps, either pre-made or make your own from old RG-8 shield braid, not ordinary wire. You want to ground the exhaust at both ends to the vehicle chassis. Extra battery to body grounds are good for reducing alternator whine..Run the power and ground leads for your radio(s) straight to the battery, dont ground it to the body, and DEFINITELY don't use the lighter plug. Thats asking for interference, both rfi and tvi.
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