Get tough with them or they will run you over. Signs will not work except to aid in prosecution. Get the sheriff and game warden involved. place game cams by your signs and get pics and turn in those tearing down for vandalism If you can disrupt them enough and ruin enough of their trips they will eventually move on to easier targets. We had the same problem when we moved to our place because the old landowner let anyone and everyone hunt. After two years of turning everyone in and firing shots in the air we finally have it under control, however, as soon as my pond is complete i am sure we are going to have it start all over again. Hopefully taking this into account while building the pond will help. The side along the gravel road that is farthest away we choked with shallow cedars, palllets and cut hawthorns and anything else to snag a lure to make it nearly impossible to fish from the bank from those areas. Then we reenforced the fence and laid locust branches on the back side then planted black berries all along the fence trying to make it impenatrable. Next we got the nearest neighbors involved giving them permission to fish (following our rules) so they would have a vested interest in keeping poachers out. Good luck