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Copper foil is (I think) the best grounding plate, doesn't need to be thick - hecks it's meant to be blown away. A thin, 3 inch wide or so, 'tape' of foil from bow to stern provides maximum linear footage for charge disapation. Connected to the mast with the heaviest gauge wire you can get to it - the foil only costs a few bucks and can be replaced every bottom job.
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