I got a Digger coil and have not used it much. Just testing with targets on the ground and the coil ground balanced, I cannot pick up a 10K thin gold ring. I have a pattern with all notches open. I also tried a buff nickel and it acts the same. When I go to the prospect mode I have to run below 12 sens and I still get an ocillaton in the threshold. In pattern mode I can run the sens up to about 20 before I get a lot of noise. My threshold is down to 4. I usually run in the disc. mode with all notches open. When I use my HF 6" coil, I do not miss anything. The Digger coil sure likes silver, penneys, clad dimes, quarters, and halves. It also likes pull tabs. Maybe the coil is just too sensitive.