David wrote:
On Sun, 24 Dec 2006 08:30:37 -0800, John Smith
wrote:

When using balanced antennas such as loops, dipoles, etc. a voltage
balun can be used, however, great detail should be paid to the symmetry
of the antenna and even one leg of a dipole being nearer a metal
building, trees, etc. can effect that symmetry.

When using unbalanced antennas end fed, long wire, monopole, etc. a unun
is better used and will even eliminate most common mode currents.

I think most here really want the Unun ...

Regards,
JS

Autotransformer

No. Quite a bit of difference between a true autotransformer and a
current balun/unun. The obvious physical difference is one
(autotransformer) has a single layer winding, the other a bifilar,
trifilar, or quadfilar winding.

JS