Tim,
A camera, informing the authorities (before he does) & keeping the note are very good advice. I would also however leave him a copy (you hang on to the original) of a note at the edge of the property line informing him that you have no intention of disrupting his hunt & explaining your NORMAL routine of monitoring all your fence via 4 wheeler. This too will become evidence should it ever come to that. I like to give people the benifit of doubt at first & make them prove my assumption they are of the decent sort is incorrect. It will look good on your part if your first response is polite. Who knows he may have been upset when he wrote the note because your 4 wheeler scared off a nice buck. Maybe he will then realize he should move his stand farther away from a known 4 wheeler trail.
Ric
