Here a re my recommendations in order:
1. Get the hell out of there. I'm guessing this one is easier said than done.
2. Do what Freezy said, and install a bunch of booby traps and intimidating security.
3. Pull some Scooby Doo magic and trick all the crazies over there into thinking your property is haunted or something. Find a way to project apparitions, or create something that would scare ignorant supernaturalist thieves, but not harm anyone if they got frightened and shot at it(ie use a scarecrow, and not your buddy in a scary mask or something).
Okay, ,that last one is probably not entirely realistic, but hey, a lot of creepy, dusty old men would have gotten away with it too, if it weren't for that dog and those meddling kids!
