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Re: [TowerTalk] Dipole gain?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Dipole gain?
From: Jim Lux <jimlux@earthlink.net>
Date: Tue, 09 Dec 2014 13:53:48 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 12/9/14, 1:46 PM, Ken wrote:
And since very few of us operate in free space, dipole gain varies all over the scale 
dependent on hight above ground and the angle you want to measure the “gain” 
at.    I have recently seen where a dipole at the proper height has up to 8 dbi gain (at the 
right height and at a desired angle).

In actuality, “gain” in a non rotatable antenna is a myth.  OVERALL, an antenna has no gain over an 
isotropic radiator, it just subtracts strength is one direction and focuses it elsewhere.   That’s good if 
“elsewhere” is the direction you want to communicate, and not good if you want to communicate in 
some other direction.


gain can be negative. It's useful to talk about gain vs directivity. The latter is assuming no loss.

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