Mac, N8TT wrote:
"It is difficult for me to see gain at the end of sn antenna wire."

Miller effect works in a triode tube by placing a larger signal voltage
on the plate than on its grid. This increases the difference in number
of electrons between grid and plate.

The charge of a capacitor is the difference in number of electrons on
the two plates.

At the open circuit end of a 1/4-wave antenna, the incident and
reflected voltages are in-phase and equal in magnitude, thus doubling
voltage at the antenna tip. This increased voltage doubles the charge at
that point over that produced by the incident voltage alone as Q=CE.

Mac is right. There is no mu factor in an antenna tip but there is a
voltage and charge gain.

Best regards, Richard Harrison, KB5WZI