Not a bad idea. I should get some of those to add to my other signs. Currently have private property, keep out, no trespassing, no hunting, and smile youre on camera. The only people who have ever ignored my signs are the adventists who live across the creek, but one winter when i was out of town my driveway which is about 130 yards long got like 3 ft of snow and the dude plowed it out for me, so im inclined to tolerate a little shit from them and just throw their pamphlets in the trash politely.