Arturo de Zorro
New member
of a coin after you had removed about eight or more inches of dirt because it became an air test from that point on. And then came the X-1 probe that would let you know to dig deeper. This issue about the Halo of the coin makes it larger, well if the detector signal comes from the halo of a deep coin that otherwise wouldn't be heard, and there is no halo in an air test, then in the dirt it will detect deeper. And freshly buried coins or where the dirt has been disturb (bulldozer), to an Explorer is the same as an air test. I have a coin garden that is just over ten years old and another that is three years old ten feet away. At the older garden I have no problem hearing the coins at 10" but the at the new garden at 7" the signal starts to break up same as an air test.