I apologize for not being more clear. The context of my comment was in
reply to a statement about the resonance somehow being different for
"current fed" and "voltage fed" antennas. What I meant was that the
antenna impedance is independent of the source impedance or other
characteristics of the source. Of course, the feedpoint impedance will
be different if you choose another feedpoint.

I'm surprised that this topic has aroused so much commentary. It reveals
a general lack of understanding about some of the most basic and
fundamental characteristics of antennas and circuits in general.
Hopefully, the discussion is helping some of the readers to gain a
better grasp of the subject matter.

Roy Lewallen, W7EL

Amos Keag wrote:
Feedpoint impedance does change. But, what has that to do with resonance??

Cecil Moore wrote:

Roy Lewallen wrote:

The impedance of the antenna doesn't change with the feed method ...


One feed method is center feed. Another feed method is off-center feed.
The feedpoint impedance of the antenna changes with position since
for 1/2WL, for instance, the net voltage is a sine wave referenced
to the center, and the net current is a cosine wave referenced to the
center. The feedpoint impedance is approximately sin(x)/cos(x)=tan(x)
where 'x' is the number of degrees away from center.