In article ,
Richard Clark wrote:

The harmonic drivepoint Zs follow their own
sinusoidal roller coaster through the shift in feed point.

Richard-

Someone asked that if the OCF Dipole was so good, why didn't everyone
use one? When I got my start back in the 50s, everyone did use one. I
used my "Full Windom" for several years on 80/75/40/10 CW and AM. In
today's world, the G5RV antenna appears to have taken over as the
popular antenna of choice, and is probably equally as bad as the OCF
Dipole.

As a teenager I knew little about SWR. I used a balanced tuner to match
the 300 Ohm feed-line, tuning for maximum brightness of a pilot lamp
connected to a loop of wire taped to the feed-line. I understood that
the feed-point was chosen so impedance was reasonably close to 300 Ohms
on all bands except 15 Meters. Your reference to a roller coaster
suggests that it might not be reasonably close.

Using the modeling software, is there a feed-point where impedance is
close to an available balanced feed-line on multiple bands? As close, I
would accept a 2:1 SWR.

Fred
K4DII