Yes indeed, the 11 inch. I have a 6 inch and am planning a test. I went over a small area littered with aluminum trash and with iron mixed in last week, hunting with the 11 inch coil, and using Park1, 50 tones, horsey on, F2-2. I found only clad, but there were multiple coins on edge. So I want to cover that with the 6 inch and see what else I get from that area. The area is less than a couple hundred square feet next to an ice cream stand, so concentrated junk and whatever falls from peoples pockets or hands.

I did find Frodo's / Gollum's ring there...... sadly it was zinc .... it really doesn't "rule them all" ... not even close.