A ski area I used to patrol at uses an old Pieps mounted near the door of the patrol shack to check patrollers' beacons as they leave. Turn it way down so it only gets people who are close by. I'm sure someone smart (not me) could figure out how to wire it so it trips a switch to open a gate.
Duh... Headphone jack.
I didn't believe in reincarnation when I was your age either.
http://www.backcountry.com/pieps-che...jE6NDpiZWFjb24
never played with one of these but maybe it would solve your issue for $20
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