[TowerTalk] Forty Meter height question..

[Jim Brown]

On Tue,10/7/2014 11:46 AM, K7LXC--- via TowerTalk wrote:
> While the antenna will be 48 feet above the roof, it really doesn't electrically  see the roof much.

Agreed. The primary effect of height will be the height above earth, 
which is what determines the vertical pattern (by virtue of the first 
reflection in the far field). You can get a pretty good idea of this by 
studying the plots in

http://k9yc.com/VertOrHorizontal-Slides.pdf

For more, simply model a horizontal dipole over a range of heights, plot 
the vertical pattern for each height, then overlay them on the same plot.

73, Jim K9YC