On 16-Apr-2008, "Jim, K7JEB" wrote:

After a bit of e-mail correspondence and the
exchange of a single, crucial, 1000-word, picture,
I think we've bottomed-out on this. I'm seeing two,
distinct, dipole-like responses, one at 3.6 MHz
and one at 10.2 MHz.

I also played around with this yesterday on EZNEC. Started with a 75 M
center fed half wave at 30 feet high, added 20 M quarter wave stubs one
quarter wave (20 M) oout from the center. Got two low SWR points at ~3.5
MHz and ~14 MHz. By changing the distances to the stubs, the length of the
stubs, and the length beyond the stubs, I got the low SWR points to 3.9MHz
(2.8:1) and 14.2 MHz (1.2:1). Azimuth pattern on 14.2 MHz was sort of
omni-directional with major lobes at 45, 135, 225, and 315 degrees.
Pattern on 75 M was omnidirectional at high angles and max gain straight
up.

Conclusions: Might be useful as a way to add 20 Meters to a shortened 75 M
dipole. High SWR on 75 would still require a tuner. Losses were not
determined. More height might help.

Ken Fowler, KO6NO