John Popelish wrote:

Picture a half wave disk of metal as the ground plane, producing the
inverted image of the vertical. . .

It appears that what I've been writing the past few days either isn't
being read or isn't being believed. Among it is an explanation of why a
"ground plane" doesn't produce an "image" of the vertical.

Since you appear to continue to believe this, please explain the
mechanism by which you think a half wave disk produces an "image" of the
vertical.

Roy Lewallen, W7EL