To comment on the post made earlier by Matt Siri
I have always wondered if the secondary of a tesla coil has any 
interesting antenna properties, as well as simply acting as the high 
voltage end in an pair of mutually coupled resonant LC circuits. I 
believe, in the transmitting dipole/quarter antenna case, the length 
of the secondary tube, not the length of the wire wrapped around the 
tube, would be the interesting variable.
Miles
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