I am about to return my cable tester. I've tried tracing 2 passes to no avail. Sprinkler Control Wire 18 ga wire. The first installation was done 200 feet around my house. The transmitter was grounded next to the box with the tracer cable. It worked great when the home cord was about 6 inches underground to about 150 feet on the other side. At this point, the receiver picked up a signal from everywhere. I tried to drop the floor, tried to move the floor. It does not matter. The second line was a direct 100 foot line of sight to the control box. At about 75 m, the line began to penetrate deeper into the ground. At 12 inches I could still pick it up, but then I had to dig closer to where the wire was to get a signal. a clear signal of where the line actually was. high.