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Suggestion A: I installed a driveway alarm at the entrance to our house, which sets a half-mile off the main road. This works great. It gives someone a notice that there is a vehicle coming to the house. I buried the magnetic sensor at the entrance and and ran the cable to the house. The cable run can be up to 5,000 feet. From the panel in the house you can turn on lights, ring bells, or whatever you want to add. We've had this about six years now and it was well worth the effort. No false alarms from rain, snow, or little animals.
Suggestion A: Use motion detectors. The only problem with these are any little critters that frequent your outbuildings will set off the alarm.