with my Explorer XS. One quarter at 7" & it was clad as at a beach where they get deep fast. Also, at a 1947 park in a grassy area, I got a 1942 wheat cent down 6". Part of my problem is I hate to dig trash, so I only dug if crosshairs stayed in upper right corner. With the sensitivity at around 22, it air tests about 10" on a dime, in the living room, with lots of electrical interference. I'm not sure if I ever got beyond 4" my first 5 times. I tried the Explorer at a 100+ acre 1800s park & all coins found were new & within 4" of surface. Horrible ground minerals, trash, "detected out", or relandcaped, so many things not in our favor. I also liked to sweep faster than is generally recommended for the Explorer, & rarely used it for long periods as it made my arm sore. I prefer another detector, for reasons other than depth. There must be a club somewhere near Cincinnati? Hope you can find some in person help, if that is what is needed. George (MN)