Cecil Moore wrote:
What you don't seem to realize is that the loaded
antenna can be assumed to be lossless in free space
with a 4-wire radial ground plane and the E-fields
and H-fields are within 10% of their real-world
values, i.e. you are complaining about relatively
small secondary effects.

As far as conditions on the antenna are concerned,
you are complaining about relatively small
secondary effects. Of course, there are large
effects on radiation and ground loss, but those
items are not the subject of this discussion.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com