I was out with a buddy who just got an impact. I seen it dig a 1844 Large cent at 10 inches. I could not separate it out with my etrac with the Tornado Coil. He was getting a solid signal at 84. I also seen him did a clad dime at 9 inches good signal. My etrac could barely hear it after he dug 6 inches down. I am starting to be a believer in this machine.