I haven't used my Small 5" coil at my house w/ my Sov. Used 8" or 10" coils. Anyway, Can you believe it? I Put on the 5" garbage coil and bagged a 1942 Lincoln at around 6 inches, sitting in an iron null field 10 feet from my test garden. My larger coils never saw it. The reading was unmistakable. Need to redo the yard with the 5" SLOWLY! Awesome coil.