Guys - my invisible fence has stopped working and I fear the yardman has cut the wire someplace. It goes completely around my house - about an acre - and is above ground in most places and visible. At least it was; now it is mostly covered with vines, etc. Is there a tool that I can buy so I can walk around the perimeter of the yard and detect where it has been cut? Visual inspection is pretty hard, especially on the old back.

Thx