I was trying if I could harvest the Earth ground current with flat pancake coil setup.
Because I didn't know the exact length of the grey wire, I'm not sure if the black wire on outside is 1/4 length from the grey wire.
So I found 2 ways to amplify the ground current, even to a maximum level that my current probe can handle. The diode across spark gap is one and adding the flat pancake coils increased the peak levels of the ringing significantly.
Still searching for harvesting it correctly.
