It is more like inmproved GM 4Pro. That type of coil use Nexus MD. If you watch it clously it hits target under Hot rock (witout GB on it). No need to fool somebody, it's just works better with small low conducted metals and I let you know that. I ordered it custom for my MD, so you need to find who'll made it for yours. Try to run that test with your MD and target will sound Fellous (tested EQ800, Nokta Amfibio, XP Deus). Why that test? It is not a ground but that scenario can happend, old building or many ceramics under groud. Done it with mineralized soil, same result, no time to shoot video. So you decide worth it or not. I will try to run your 3D test, thanks.