The last decade or so, and it seems like more and more as time goes by, I hear people who almost always talk about deep. They want better depth. A bigger coil for better depth. Higher sensitivity for more power in more depth. Death, death, Death. It kind of grows old.
Oh, don't get me wrong, the anfibio can definitely provide very decent depth of detection. But you only able to get depth in an area where you're not dealing with a lot of shallower masking targets. Therefore I'm glad you concluded by saying you're getting a different coil to work in trashy areas.
I try to spend most of my time for the last 36 / 37 years Relic hunting primarily very dense iron littered sites. Non-ferrous debris also, but the density of iron trash really calls for a lot of patience and working a smaller coil. But I also do a lot of urban coin hunting where I use Relic hunting type methods of a small search coil, and patiently hunting slowly and methodically because I'll be working renovation work, construction sites, demolition sites, or vacant Lots that have been so for a long time and had some former structure and again a lot of ferrous and non-ferrous metal to deal with.
In the very dense iron contaminated sites the best coil I used on any of the Nokta./ Makro products is 5 in Double D. Otherwise, if a site is low to modestly littered then my favorite coil is the 7 inch concentric. One reason is because it balances very well and that reduces fatigue, another is that because it is a concentric coil you get very good depth for the quail size and you get better discrimination then from a Double D coil. And the third reason is that due to its coil size and coil type, it does a much better job of helping to Aunt handle problem iron such as resting shards of 10, washers, and those blasted man-made bottle caps good
Nothing's perfect camera but using that 7 inch concentric really helped with the very annoying targets. I know some people like the 9-inch, probably due to size, but I didn't care for it. The rod mount is closer to the rear of the quail rather than close to the coil Center and that makes it feel imbalanced and nose heavy, to me, and the coil in hand just feels heavier for its size.
It's more of a midsize coil and 4 places where I want have maybe a little more coverage then my favorite coil is the 5X9 1/2 DD open frame coil.
On my Racer 2 and Impact as well as the Kruzer and Anfibio , the seven in concentric I kept mounted full time for everyday use, the five in at the ready for very dense trash and elliptical Double D for some sites that I liked it for, and without hesitation the excellent 11 inch round Double D for the open areas where I could make use of the extra depth of detection such as wide open parks, fields, beaches Etc.
Just be outfitted with the right coil for the task at hand and site challenges you'll face, and the new detector you're getting is sure to be able to perform well.
Monte