The perimeter loop cable around my lawn for my automower is broken.

I have a cable fault detector with a tone generator and a "pen"
receiver, which can trace along the cable, but it doesn't work when the
single wire goes under ground or concrete.

I wonder if a network/telephone cable tester can work on a single wire
underground.

I'm looking at

http://www.ebay.co.uk/itm/Portable-N...r/181692076054

After all, a single wire in the ground should look a little like a
coaxial cable?

Leif

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