JB wrote:
Actually there is no reason TO have a resonant length antenna if you can
tune it electrically.

Actually, tuning it "electrically" *is* tuning the antenna
*system* to resonance. When I vary my ladder-line length
to achieve system resonance, I am using my feedline as a
series tuning section. When one achieves a Z0-match with a
tuner or by other means, one is tuning the antenna system
to resonance which, in a near-lossless system, results in
near-conjugate match and near-maximum power transfer in
either direction (assuming the receiver input impedance
equals the Z0-match impedance).
--
73, Cecil http://www.w5dxp.com