AV multiband VLF receiver

[mustefa ubram]

Excellent wm6 for schematic
wm6 and j-p
I have no experience with this frequency range.and i have question
How to measure the resonance frequency of the use of metals in the circuit when the transmitter?
Whether the transmitter of the loop antenna to generate frequency vlf is right?
Vlf range of frequencies to transmit and detect what is right??(3kh-4kh-5kh.....30kh)
Transmitter frequency to the ground after hitting the metal out of the ground in what form?
The receiver can reveal how the radial wave vlf?