A ham over on eHam.net wanted to know if a 40m EDZ
would work on 80m. Of course it will if fed correctly
since it is about 166 feet long. The question is: Is
there a fixed length of ladder-line that will work both
on 40m and 80m? I fired up EZNEC and started cut and
trying. I found that a 144 foot 40m "EDZ" would yield
some interesting results. I went out and extended my
130 foot dipole to 144 feet and was impressed.

I found that a 144 foot center-fed dipole fed with
~88 feet of 450 ohm ladder-line was resonant on
7.150 MHz and my IC-756PRO would tune it over the
entire 40m band. 40m is my favorite band.

In addition, the IC-756PRO tuner will tune the same
antenna system over a 3.7-3.9 MHz range on 80m.

In addition, the IC-756PRO tuner will tune the same
antenna system on 30m and 17m.

I've already got a rotatable dipole for 20m-10m and
this antenna tunes on 80m, 40m, and 30m.
--
73, Cecil http://www.w5dxp.com