FWIW, http://dixienc.us/28FtVert/28FtVertical.htm
might help you make some decisions.

Unless you already have the materials I suggest you build with ten
foot lengths of chain link top rail. The last time I priced it at the
home improvement store it was $11 per section.

If it were not for the price of the tuner it would be a cheap antenna.

Every time I tinker with it I learn a little more.

If DX is your thing, go for the low angle radiation for your favored
band. DX is of little interest to me so the high angle radiation on
some bands just gives me a different set of Hams to work.

John Ferrell W8CCW

On Tue, 9 Dec 2008 23:11:10 +0100, "Fred PA0FVH"
wrote:

Dear group,

As a temporarily solution I would like to use a cheap 5/8, 6/8 or 7/8 WL
commercially available CB antenna as a non resonant vertical with elevated
radials for use on 10 - 40 meters tuned by an automatic remote ATU at the
base of the antenna. I used MMANA and EZNEC (demo) to calculate the expected
impedance for the frequency range and found too many results for the height
of the antenna. Now I am confused about what to select.
Is 5/8WL on 10meters a good height or 8 meter (22')?
What I want is a low take off angle on 20 and 30 meters with high efficiency
and an impedance which my remote ATU can handle.

Fred, PA0FVH