[TowerTalk] rotating delta loop

[john at kk9a.com]

What is your quad's boom length?  I just modeled a 4el yagi with a 32'
boom at 75' which is a simple antenna to build and install. The gain, over
ground, is 14dBi.

John KK9A


To:	towertalk at contesting.com
Subject:Re: [TowerTalk] rotating delta loop
From:	 Brian Alsop <alsopb at nc.rr.com>
Date:	 Fri, 30 Aug 2013 13:47:39 +0000

I had a four element GEM quad (second director to reflector spacing
element spacing on 20M ~22'). I modeled it in EZNEC.

With ground reflection gain, it came in about 15 dbi on 20M.

Subtract about 6db or ground reflection gain and it becomes 9 dbi.
Subtract 2.2 db and it becomes 5.8 dBd.

So something like the quoted 11.5 dBd is a reasonable number if it
includes ground reflection gain.

73 de Brian/K3KO