On Aug 30, 5:44*am, Richard Fry wrote:
... let us consider a base-fed 10 foot whip at 3.8 MHz ...
Without using a loading coil, the input Z of that whip is about 0.6 -j
1250 ohms.

A 10 foot whip at 3.8 MHz is about 0.0386 wavelength or about 14
degrees. That's about -j4.0 on a Smith Chart. Can we say that -j1250/
Z0 = -j4.0? such that the Z0 characteristic impedance of the whip at
that input Z is ~312.5 ohms?
--
73, Cecil, w5dxp.com