So if I read the foil hat report right they performed well but a kayak is still too small of a target to get noticed easily and its signal is usually lost in the clutter filter of the radar unit.

So besides staying out of the shipping lanes what else can you do?
Is there any way to make a small powered radar beacon that would give a radar signal, hopefully warning ships that you are there?
Maybe it could pulse the signal in such a way that they know you are a small craft instead of another drifting oil drum.