You can receive with a coat hanger and don't need a ground.
To transmit, you just need a good counterpoise. A dynaplate is ok but if you pick up large masses of metal like your engine block ,metal water or waste tanks and even your metal rub rail, you should be able to transmit without a problem. Bronze screen and 2" copper bonding foil laid in the bilge close to your tuner will really make it perform well.
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-Shawn-
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