Zaxcom All-Digital Wireless has the best sound of all imho, with real balanced inputs and 117dB dynamic range, and they also have a two channel receiver for camera-mounting.

Secure communication, although this may not matter for a fishing story unless you're fishing in Loch Ness :O).

It is the closest thing to a cable audio-wise, and they have very small transmitters which is not harmful. Up to 50mW output for long range, and you can safely use rechargeable batteries. Transmitter can be remote controlled from an iPaq PDA, etc.

Executive Summary: Orgasm on wheels.