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.

10.2/3.6=2.8 It appears that frequency ratios
between about 2.4 and 2.8 can be easily achieved.
That's 75m+30m, 40m+17m, 30m+12m.

Unfortunately, a 2:1 ratio seems difficult to
achieve.
--
73, Cecil http://www.w5dxp.com