15x 17 coil

That's what larger coils do, they give you greater depth although the larger and deeper you get you will lose a little sensitivity to small objects. Pinpointing is a little harder the larger the coil, but the larger the deeper, simple as that. All detectors are the same in this situation.
 

A couple of things I noticed about my big coil (albeit its not on an AT pro)...

1) It really is deeper.
2) I expected it to be more chatty.. It isn't. (my machine is chatty when running hot, but the big coil didn't make it worse)
3) My machine has a fast recovery, so the big coil gives a double signal on shallow (less than two inches) targets... beep-beep beep-beep.
4) It isn't any heavier than my concentric coil.
5) I thought it would be harder to manage, but so far it isn't (although I have yet to take it into deep woods, and am not sure I would)
6) I like it.
 

I agree with OWK.. I have a 15 inch attack coil on my Pro, and it works awesome.
 

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