Reg writes:

It seems Yuri is interested in modelling short, coil loaded antennas. He
refers to controversy. I can set his mind at rest and assure him there is
none.

When the length of a loading coil is short in comparison with the overall
height of the antenna, certainly in comparison with a wavelength, the
current into one end can be assumed, with negligible error, to be equal to
that which comes out of the other end as with any other coil in an L,C,R
network analysis. Its stray capacitance can be ignored except for
investigating its self-resonant frequency.


There is none? You are confirming there is one by your above statements.

The point is that W9UCW measured, that difference in "normal" loading coil
(not long coils or helicals) is in order of 40 to 60% less at the top of the
coil. That is significant in calculating or optimizing the efficiency of loaded
antenna. MEASURE it and don't rely on myth perpetuated since 1955 by Belrose
till today's ARRL Antenna Book. ON4UN has it right in his book.

Resonance is no big deal, efficiency is greatly affected, modeling programs are
way off especially if you include more loaded parasitic elements.

Did you read my article, facts and measurements? You can try to repeat the
measurements to validate the effect. That's what I am looking for, if we are in
error, would like to have it pointed out. Not speculations that it "should be"
like that.

Yuri