Re: [TowerTalk] Omnidirectional antenna for domestic contests. TowerTalk Digest, Vol 154, Issue 16

[Jim Brown <jim@audiosystemsgroup.com>]

On Sun,10/11/2015 12:06 PM, Stephen Davis wrote:
> A very easy to put up, with good results to a distance of 400 miles (at least 
> from here in MA) , omni directional , is a NIVIS.
This is VERY wrong. See http://k9yc.com/VertOrHorizontal-Slides.pdf  The 
major characteristic of the very low dipole you describe is poor 
efficiency at all vertical angles. The polar plot done by modeling 
software makes it LOOK like its good at high angles, but it isn't -- 
most of the TX power is lost in the earth.
73, Jim K9YC

73, Jim K9YC
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