Richard Clark wrote:
Appeals of authority that are pegged to Cecil are like trying to tread
water with a concrete life preserver. Your logic is blighted by a
forced conclusion that has nothing to do with the obvious observation
that antennas, as transmission lines, are quite evidently non-linear
in their characteristic Z. This has been demonstrated and is historic
from sources that even Terman's accepts.

There exist transmission lines with a changing Z0 along their
lengths. Those transmission lines are linear systems.
--
73, Cecil http://www.qsl.net/w5dxp