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.