>Ground resistance is not worth in such a conditions. Coil (or
>high voltage transformer) resistance is much grater anyway.
 
So, the coil losses decrease with it's L (assuming a given wire diameter, coil 
diameter and spacing and so on) and thus it is good to decrease the needed L. 
So we have to spend a high coupling capacity to ground (at the end of Pete's 
inv-L) and thus it may be useful to spend a high metallic area to ground which 
can easily be done by such a foil ;-)
 
BTW, i do not think that the resistive losses at the "ground coupling end" of 
the inv-L would be reduced by lifting the foil some cm/inches above ground. The 
E-field lines in this capacitor model (foil-soil) will have to pass the same 
way. 
 
Stefan/DK7FC

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