Re: Idea for a ground..

Since a Tesla coil can be thought of as an antenna (?),  - or more 
specifically as a 1/4 wave vertical - wouldn't  it be almost as effective
to just use a metal sheet under the coil as a ground plane?

One could approximate this with just radial wires - or use a mat of
link fence or 'chicken' fence.

By the way, I have never connected the 'bottom' of my secondary to 
earth ground - just to the bottom of the primary - which goes directly
to one side of the transformer - so it is 'floating.'  Any comments
on this practice???  (This is a 2 KVA system - (secondary is a 4" diam by
1 meter long coil.) currently throwing 1 meter long sparks.)