Hi All, I've been loaned a 12 x 8 Evo coil to compare with my 12" Evo round. I placed 2 pieces of gold in the ground, an 0.6gm nugget at 6" deep and an 0.04gm piece at nearly 3" deep , both targets I could hear with the 12" round. With the 12 x 8 I could hear a very faint signal on the 0.04gm piece. The o.6gm piece I could not hear a peep out of it with the 12 x 8. So I did not buy the 12 x 8. I must say that the 12 x 8 was not the latest production model, it was a prototype model coil, this was done with my GPX 5000 in fine gold in VIctoria, Australia. Cheers, Hermann.