In article ,
Wayne wrote:
So, lets begin again, with no distractions.

What is the purpose (or benefit) of using a 1:4 unun on a 43 ft
vertical.

http://www.eham.net/articles/21272 has a nice analysis.

It looks to me as if:

- Without a 4:1 unun, the antenna provides a very nice match at three
frequencies with in the HF band. At other frequencies, the SWR is
up over 10:1 much of the time - high enough that a coaxial feed
can be rather lossy.

- With a 4:1 unun, you do lose the excellent match at those three
frequencies... but the match gets better at most other
frequencies. The SWR across the HF band is much more uniform, and
lower on average... low enough to cut the coax losses somewhat and
(I think) within the matching range of many rigs' "line flattener"
built-in autotuners.