Put a small radio with fresh batteries in a zip lok bag and hide it near the line on your property early on the morning you most suspect that he will be hunting there. Find a rap music station, you won't have to turn it very loud, just enough you are sure he will hear it.

Get out there real early...buy a realistic Mckensie Decoy and setup in cover/brush to mask it. Run some mono fishing line to a tree branch near the head.

Get a video camera...wait for the guy...pull on the mono to look like a rubbing animal..and see if he shoots.

The GW's do this all the time. See if the GW will put out thier decoy?

OR...put up a dummy decoy surveillance camera aimed at his stand and tell him its a wireless continous feed to a computer recording his every move.

Tough situation.

I had three stands hung on a piece land (real estate company owned) next to our land. All of which are on the property line facing away from our land. The land the stands are facing is open fields, my land is timber. Its Very Dirty, but Legal.

I got a trespassing ticket once. Well because the property owner told me I could hunt on the other side of a private gravel road becuase he let them hunt over on his place. Well, after haveing a monster eight point chase some does that were in front of me feeding I headed back. The GW's at my truck said I did'nt have it in righting. After trying to contact the owner it turns out a developer had bought it so I had to pay a ticket. It was thirty-five dollars, I was pissed.