Richard Clark wrote:
Just think of the antenna as the "source" and consider its
characteristic Z.

"Characteristic impedance" is not the impedance associated
with choking requirements. That probably should be
"feedpoint Z" (source Z for receive).

For standing wave antennas the characteristic impedance
and the feedpoint impedance are usually quite different.
For a #14 wire horizontal 1/2 WL dipole at 30 ft., the
characteristic impedance is in the ballpark of 1200 ohms
while the feedpoint impedance is in the ballpark of 60
ohms.
--
73, Cecil http://www.qsl.net/w5dxp