My father used to build his own VHF ham radio aerials in the days before telephones were invented here. What he used to do was cut holes in a plastic lid (about something the size of a large aerosol can lid) and make the solder connections from the elements to the coax inside the lid. Then when ready he would fill up the lid with isopon P40 - wait until set - end result was very strong and totally waterproof
Of course if you isopon'ed the aerial into the back of a radio you'd never get it off again but it wouldn't leak
A Boat is a hole in the water, surrounded by fibreglass, into which you throw money...
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