If It were me, I would feed the tower with an elevated radial system,
insullated from the tower, placed down 1/4 wavelength electrically from
the top of your 'loaded' tower (loaded with HF antennas as capacitance
hats). BUT -- Don't put the center conductor of the coax to the tower,
put that to the 4 elevated radials, and put the braid to the tower.
That keeps all your electrical grounds consistent. Take a MFJ analyzer
and a 1/4 wave "radial" up the side of the tower and connect the
'radial' to the center of a short piece of coax. then touch the braid of
that coax to the tower as you climb to find the 'resonant' height.
Don't forget that a good ground screen under the tower on the ground or
buried will increase the performance.
Good Luck.
Pete N8PR
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