Here is a video of a test fixture I made to test the Sovereign Amplifier. I know Air testing is controversial as to how it translates into actual detection depth in various ground conditions. Im not claiming anything here, just posting a video for all to watch...
Shaun....
http://www.youtube.com/watch?v=twQsExBnm7o
Shaun....
http://www.youtube.com/watch?v=twQsExBnm7o