[TowerTalk] antenna choices

[john at kk9a.com]

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


To:	towertalk at contesting.com
Subject:	Re: [TowerTalk] antenna choices
From:	Jim Brown <jim at audiosystemsgroup.com>
Reply-to:	jim at audiosystemsgroup.com
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