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I didn't read all the posts so I don't know if this was suggested or not. There are driveway alert systems that are reasonable and wireless. You could put the sensor/transmitter somewhere inconspicuous (outside) near your buildings and the receiver at your neighbors. Some transmitters have a range of 2,500'. If someone breaks the beam an alarm sounds on the receiver. Some units can handle 4 sensors. An intruder might not notice this as much as a security camera. http://www.drivewayalert.com/

Here's another company that has other wireless driveway alarm options (IR, photo beam, magnetic sensors for cars/ATV's only not people/animals etc.). Check out the accessories section for special sensors or phone dialers (the receiver can call you automatically instead of your neighbor). http://www.reliablechimes.net/index.php

Just another idea.