You can get a transmitter and a receiver for about $50 from
Visitect Inc., PO Box14156, Fremont, CA 94539; e-mail:
support@xxxxxxxxxxxx; telephone: (510)651-1425.
They have a range of 150 or 300 ft, depending on which
transmitter you order. The receiver would need to be put in
a small case, but the transmitter is ready-to-go. With the
2.5mm plug (monaural, not stereo), it should do the job. It
is described as being suitable for garage door openers, and
that involves the same requirement, ie: closing a circuit.
Good luck!
Ben Melton
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