"Cecil Moore" wrote
It is physically 10 degrees tall. The physical height is what determines
the radiation pattern. It is electrically 90 degrees long. The electrical
length is what determines the feedpoint impedance. Where does that 90
degrees of electrical length come from if not partially from the coil?
________________

The intrinsic impedance of the radiator consists of its radiation resistance
and its reactance. The proper loading coil can provide a net reactance at
the feedpoint of the antenna system of ~ zero ohms, but that hasn't changed
the radiation resistance of that short radiator.

So the coil-loaded, short radiator is not really "electrically" ~90 degrees
long -- it just has the reactance of an antenna that is ~90 degrees long.
The coil-loaded, short radiator itself still doesn't have the radiation
resistance of linear, 1/4-wave antenna. That remains a function of the
electrical length of the whip, itself, apart from the effects of the coil.

RF