To project horizontally from a ring to a ring at high frequency electrical wave to be gripped by toroidal winding, catching the wave as they pass through. Look mom no wires from high tension pole to pole just rings like a dog jumping through. To form the massive resonance needs to be reflective to a no polar backing thus the nickel back stop. Sure it going be pretty big at first but better design I can see smaller back stops such like size as a Dixie cup with a cone of nickel as well both cup and cone made of nickel.
Nickel if you do not know can not be polarized.
I take this theory from flash point of fuels lower the reflection to the flash point.

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