Roy Lewallen wrote:
SNIP

Tuning a close-spaced multiple dipole like this is time consuming. You
begin by adjusting the length of the longest one to resonance. Then you
adjust the next shorter one, and so forth. It might be necessary to
repeat the process after the first time through. And, as I mentioned,
you'll end up with some pretty narrowbanded antennas, and the lengths
won't be what common formulas predict.

The interaction decreases rapidly as you spread the dipoles apart. If
you can get them around 30 degrees apart, the interaction is minimal and
you can just about treat them like separate dipoles. A lot of
installations fall between these extremes, so the dipoles have some
interaction but it's not as severe as it is when they're very closely
spaced.

Roy Lewallen, W7EL

Roy,

My experience confirms what you report except for the bandwidth but
I did use a balun. My elements are spaced about 7 inches apart and
run parallel to each other. The elements are for 10, 15, 17, 20 & 40
metres with pretty effective operation on 6 and 12.

You can see the figures for the elements he
http://www.radiowymsey.org/FanDipole/FanDipole.html

Charlie.

--
M0WYM
www.radiowymsey.org