Reg Edwards wrote:
. . .
Fact 3.

The radiation pattern of a short vertical is fixed and remains independent
of the location/height of the loading coil.


True for practical purposes. People using antenna modeling programs, or
people adept with analytical techniques, will find a small difference in
pattern as the loading coil is moved, due to the changed current
distribution. But it's an inconsequential difference.

Roy Lewallen, W7EL