I've thought about getting some signs made up at my local print shop and put them in the woods. Once someone is far enough on my property (btw they have passed the no trespassing signs) then I know they are up to no good. The signs would read "Caution: Trail Cameras are present. If you care to steal anything your picture has already been taken." I have only one camera but it would make them think about where the "other" cameras may be if they spotted my camera. BUT some people just don't care and would take it anyway. Heck they still rob banks don't they?