Took the day off yesterday and used my 17in coil in a field that was used over the weekend for a chowder festival and found a few dollars in change in about 3 hours and it was down about 3 inches the display was saying 6 inchs and the vid are a little off compared to 11 inch coil. Not much found on the surface thought I'd find more on the ground.. I then went in the woods at some old cellar holes with the 6in coil and same thing depth and vid's off a little from the 11 inch coil. They worked good wish I found more stuff though.