I’m currently designing a foil assist motor with battery and all components in one unit and was wondering if anyone has an idea of getting the connection to the remote without putting a antenna via a cable to the top of the board and is it possible to do something like boost fin do as they don’t have a cable running to the board. Thanks 
It‘s physics, hard to trick. You could use a remote with a lower frequency, i.e. in the 400MHz band. Most commercial Receivers are in the 2.4GHz range, which can hardly penetrate water.
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I think this would be the way to go. Or use acoustic principle.
Even harder to beat in salt water!