[TowerTalk] polarization change

[Dan Zimmerman N3OX]

>
> In fact, it turns out that you don't
> really need to obsess about having two orthogonal antennas, since the
>
polarization for HF antennas close to the ground is pretty funky and has
> lots of wiggles and bumps.


Not to mention the fact that you don't have to make much of a rotation to
get a lot of improvement due to the strong angular dependence (in a
logarithmic sense) near 90 degrees.

Here's a plot of cos^2(theta) expressed in dB:

http://n3ox.net/files/polmatch.JPG

Seems like you can probably easily pick up 15- 20dB just by having a couple
of antennas with polarization tilted 20 degrees from each other.