Art wrote:
"And "end effect" is the confusion created at the top of the radiator."

When the signal arrives at the open circuit end of the antenna, current
can not continue its forward flow. It abruptly stops, no longer
producing a magnetic field.

Energy from the magnetic field is converted to energy in the electric
field for an instant (Cecil`s famous conservation of energy). This
produces an insreased voltage at the open circuit end. This incresed
voltage has more capacitive effect, akin to the "Miller effect" caused
by the higher signal voltage on the plate of an amplifier vacuum tube
than on its grid.

On a transmission line or on an antenna system, we used to call this
capacitive action the "Ferranti effect"

Best regards, Richard Harrison, KB5WZI