Ian White, G3SEK wrote:
This brings us back to the question of practical loading coils, and how
much radiation (and therefore current variation along the length) we can
expect.

For the feedpoint impedance to be purely resistive in an electrical 1/4WL
shortened vertical, the current must undergo a round trip phase shift of
360 degrees and the voltage must undergo a round trip phase shift of 180
degrees. The loading coil must provide the phase shift that the antenna
doesn't provide. For a typical 75m 8 ft mobile antenna, the coil must
provide approximately 80 degrees of phase shift.
--
73, Cecil http://www.qsl.net/w5dxp



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