John,
For the 14mhz model, try using mu 125 material (FT240-61)
as you getting near the point with hard ferrites (31 and 43)
where their absorption properties are becoming significant.
An image borrowed from wa7ark, Mike is something I find more
important. The antenna is a 80-10 End fed in harmonic modes.
The transformer losses are less relevant when you look at the
patterns as its not whats the loss in the transformer but where
is the RF going? The broadside 80m pattern is an end fire
20m pattern with broadside nulls.
Allison
