Hello Lancer:

How did you measure the elevation angle? An actually swing of the
antenna on a range, or probing the field? Gee whiz that is a significant
change there.

I have never ran a tower up looking at a none ground plane antenna. Its
always been with a beam or my Interceptor 10K 5/8 wavelength ground plane.

Jay in the Mojave

Lancer wrote:

Jay;
I plotted the Imax, and at 21' the take off angle was 28.4 degrees.
At 36' it was 8.1 degrees. Quite a change, the changes from 36' on up
were more subtle. Of course there were a lot of minor lobes, maybe
why you didn't see any big jump around 36'