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Well you got a few options then, what this says is that it is an Radio Frequency signal that is being emitted and the vhf is picking it up much like a regular radio signal. If it stayed when you disconnected the antenna then it would mean that the noise was coming in the power line which it's not.
1. Try moving the antenna away from the FF itself, it may be close to it.
2. Disassemble the Fishfinder and spray the inside of the plastic case with EMI paint-this is a conductive paint meant to be a "spray shield" for emi problems such as this.
3. Junk the fishfinder because it's not meeting FCC part 15 rules & regulations which it must do for a consumer product....it is not supposed to generate this crud at all. But good luck going after the manufacturer.....they could care less.
If you can't find the spray paint I have some here, so if you want to take it all apart and bring it up here I can spray it for you, dries almost on contact.
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