Thx morgan and it's very good you bring the important facts up: "Not working as described".
Sparzed sounds from a detector that costs 1000s of dollars... - even if 4m for a coin is a respectable distance!
But what you do if the sounds vanish in thin air or the pinpointing with an usual MD fails...
We need reliable equipment and signals - we also don't use shovels made out of cardboard - we have to analyze the real potential and "quality" and don't rely on "good looking" advertisment infos!
What I'm missing is the shielding in other directions! I built a cantenna for WLan WiFi and worked alot with antennas and ant.amps and have 3 sat-dishes on the roof and they all work directional!
So how a LRL should work properly if it receives "ball-like" the EM-disturbances from all directions? And this is even if the antenna has some "directive form" as long as it is not properly shielded or housed in a metal-tube like my USB Stick cantenna below, which still has a 45° working field.
The Mineoro is in a wooden box because of reducing static electricity-fields and I doubt it has a directional shielding inside at all.
Before I will put many hours in electronical building, engineering, testing and finetuning work:
Please tell me if the ionic-electrostatic field detector from 2008 found here:
http://www.geotech1.com/forums/showthread.php?t=14731
is the best choice or do exist better schematics meanwhile? The same question about the Alonso PistolDetector (is this the same as Gold Gun AL718?) you and Geo prefer.
Of course I will tell you in return if I'll find out any improvements (of course I will make them), because I can put really exTreme huge effort into something and can make excessive tests, too.