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Re: [TowerTalk] antenna choices

Subject: Re: [TowerTalk] antenna choices
From: "" <>
Date: Tue, 7 Apr 2015 06:49:25 -0500
List-post: <">>
OptiBeam designs their antennas using EZNEC+ and I would believe their
gain figures.  A Force12 C3 is also a great performer with only two
elements per band so I am guessing that the other band elements are acting
as directors or reflectors to improve the gain.  Interlaced beams are
complicated designs.

John KK9A

Subject:        Re: [TowerTalk] antenna choices
From:   Jim Brown <>
Date:   Mon, 06 Apr 2015 22:47:01 -0700

Now, look at the Optibeam numbers and description. This is a 2-el Yagi on
all bands except 10M and maybe 12M. The gain numbers are 4.3-4.5 dBd which
translate to 6.45 - 6.65 dBi (free space). That's slightly better than a
near perfect 2-el Yagi, so there's either some design magic or some
specsmanship happening here too. :)

73, Jim K9YC


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