What have we learn in all this time?

[Clondike Clad]

Do we have a circuit for a real working LRL that can pick up a coin or ring at 10 meters.
Do we have a real working LRL that will pass a DB test.
Thae question is WHAT HAVE WE LEARN ON THIS FORUM.
Me first:I can build them but I can't make them WORK.
Most of the circuits are full of pure you know what.
How can you pin point a ring or coin from 70 meters away.
It could be that I just learn the wrong electronics.
So for me most of the stuff on this forum will not fool anyone with a good electronics education.