I will take your advice. I plan on learning the AT Pro before I invest on an aftermarket coil.
I do plan on going into open spaces here in Colorado and most likely I will get either the NEL Storm or the Attack.
In any event, I'm going to order the Hunter from NEL for sure and see how I like it.
My AT Pro is scheduled to arrive Monday. I've ordered it with the basic package; 8.5x11" PROformance DD Search Coil.
I'm definitely going to document all my testings with it so that when I get the NEL Hunter I can make a comparison in both air test and more importantly in-ground test to determine depth capabilities, noise levels, etc...
I've been doing a lot of research lately for hours on end, and I've learned that the recommended maximun size of a coil for a VLF detector is 15" or 30cm where as a much bigger coil will be best on a Pulse Induction machine
That being said, again, I've been doing a lot of research and reading to the point of almost an obession on anything related to metal detector there is to be known and I plan on getting a shoulder strap once I get my NEL Storm or the NEL Attack coil.