http://www.gadgetshack.com/all-categories/wireless-driveway-alarms/4-mile-murs-driveway-alarm-with-radio.html#.WFsxavkrI2w
Thought id share this. Its essentially a game camera that doesn’t take a picture but notifies a walkie talkie with a 2 mile range. It will also work in tandum with 4 units telling you if someone crosses path 1, 2, 3, or 4. I think that this will be extremely helpful for small groups defending themselves. Don’t forget to get plenty of rechargable aa batteries or they wont work 8)
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