I found some older info from Dell Winders says the signal line extends between a few inches and 50 feet (15 m) past the target. Later info said 10 - 15 feet (3 - 5 m) and 200 feet (60 m). Quite a difference there and I think it depends on how much power the locator has and locating conditions. I walk along the signal line with one rod and look for a response at the target. But it is best to set up the tansmitter at another spot and find where the two lines intersect. You should be close to the target at this point.
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