Got my 6' coil from Richardbackwood detecters.Tried in my coin garden.Park 1 - 21 gain swing speed 5 iron bias 3 hit 9' dime clad 9' nickel clad so you know it is there my soil is pretty tough.Nice coil small.Have 9 different detectors. 2 to 3 coils each.Depth wise it beats or is even with my 7 to 8 inch coils.Have to try it some other places. Hit the 9 inch in park 2 and field 1 and 2.