My point is that even if they can put that kind of technology in a hand held detector, and even if it can get more than a few inches of depth without a massive battery, and even if it will have enough resolution to see coin sized targets...Then how is that exactly an advantage over using a VLF detector? A good detector will tell you the difference between a zinc penny, a bottle cap, or some other coin. I doubt the resolution, no matter how good, will be able to give you enough detail to tell coins apart, let alone bottle caps from coins and such. And, in terms of gold rings, I highly doubt there will be enough resolution to know much more than it's a round ring-like object, but not be able to tell if it's say a round tab versus a gold ring. I might be wrong and some day that kind of technology might exist on the consumer market, but even in the ultra expensive commercial market I don't think (?) ground penetrating radar, no matter how far advanced, can see tiny objects very well, let alone enough detail to know what the object is. It might be able to tell it's round, but I doubt you will be able to tell anything beyond that. If that's the case then I'd still rather have a VLF detector, because I can easily ignore zinc pennies, bottle caps, or other round junk, while looking for coins from say copper penny on up in terms of conductivity. And, as said, far as I know ground penetrating radar can't see through metal objects, so masking is still an issue just like it is for VLF. Now, as I said before, I'm in no way an expert on this stuff. I've just briefly read about it here and there over the years on the net. I could very well be wrong in the gist of what I *think* I know, so feel free to correct me.
