Coin at 20-25 m ? It was 1 mile or not ??? Now 20-25 meters only !?
Who tell I can detect a coin at 1 mille? You're sick, man! Mixing all, no precission, and you're of the IW!! With this "precission" you make your bad coils!!!
Problem is that those BS you're talking about cost thousand dollars... and for what ? For nothing! No science, no detection of anything but noise, nothing of nothing !
Your followers think you tell truth, but you're lying here!
If you can't build a decent coil, how can you pontificate about other thinks?