Heres an idea, you take a couple of cases of those pull string fire works(ive used this idea before) wrap them together, so it looks like one big fire work, or make a rope booby trap with them and put it betwen two trees. If it works out right you can here it from china without blowing the old farts legs clean off, but you will know if he is on the land. It sounds very crazy but sometimes you have to go commando z, some one stole my Dads climber this past season and that realy ticks me off. Im thinking about getting a camera to see if I can get a pic of him on our friends land that we hunt on, and also to check deer pop. sorry about the stolen cam, but it will continue unless you make sure the man knows you mean bussiness. Good hunting all!