This work for very long distance (around 5Km) and only for buried valuable metals. I did test with it and works very stability.
And My Homemade PD :
Works so:
Ferrite+IR
Ferite+MD+Stimulator coil
Only Telescopic receiver
Only MD with autotune
MD+ Ionic and Electrostatic receiver.
Thanks Esteban ,Thanks Morgan for all.