andy wrote:
Probably could get 80 another way. Ok, but I still need to find
"magical" antenna wire + feedline length combination. For that,
probably 10 to 20 metres around that fishing pole. Could I model the
vertical section as a straight (20m for example) and get same results
as if the wire was coiled.

No. You might try modeling it with a number of lumped inductive
loads distributed over the length of the antenna.

Dont want to model helixes!

Helixes make poor multi-band antennas because of self-resonance
effects. And remember, when a vertical is made longer than 5/8WL,
the take-off-angle increases possibly causing a lot of your radiated
energy to be lost in space.
--
73, Cecil http://www.qsl.net/w5dxp

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