Topband: Antenna thoughts

[Richard (Rick) Karlquist]

On 3/2/2021 11:19 AM, Dave Cuthbert wrote:
> John, here are EZNEC results for your downward sloping inverted-L and your
> T-vertical.
> 
> Inverted-L radiation resistance = 8 ohms
> T-vertical radiation resistance = 12 ohms


When doing these comparisons on 160 meters, it is crucial
to use the EZNEC "Desc Options" setting (2nd from the bottom
in the main window) to plot vertical and horizontal
radiation separately.  Then count only vertical
polarized radiation as the "money spec" (as
we used to say at Agilent :-).  If you use combined
polarizations, it is very easy to be fooled into
thinking that an inverted L with a very long top has fantastic
efficiency, vs a T vertical.  Well, I will grant you
that it is very efficient at warming the clouds.

73
Rick N6RK