In article , wrote:
You can buy an electric signal tracer at many of the larger hardware
stores. They are under $50 for most. You hook they device on the end
to the wire. Then you follow the path of the wire with another
handheld device and either listen to a tone or watch for flashing
LEDs.
These are made for wiring in a building. Dont know if it will work
underground.

As previously posted... a portable AM radio is the only thing you need.

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Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.