Topband: Another Spitfire question

[Tom W8JI]

How can I tune the parasitic elements (with an analyzer) when supported by a 
permanently grounded (shunt fed, Omega matched) tower?
>>>

You can't, at least not in a meaningful way.

I read the tuning procedure requiring the tower to be ungrounded? - non 
resonant, in order to set the length of the parasitics?>>>

Yes. That would have to be the case.

Also - with Tom's analysis, that the parasitics are actually sloped 
verticals - by virtue of the horizontal portion ground coupling - wouldn't 
one be better off stringing multiple (exactly opposite) counterpoise 
wires?>>>

It would make the array less sensitive to ground losses under the 
counterpoise.

Halfwave antennas are really only half wave antennas when they are 
reasonably straight. When we severely bend one and place the bent leg very 
near earth, it really becomes a Marconi with a counterpoise. The wire near 
earth is really just a single elevated radial, no matter what we want to 
call it.