I have the N0AX/K7LXC books. As Jim states they are excellent. All of their
vertical tests were done with an extensive radial field. Even the antennas that
claim to not need radials.
I understand the reasoning for why they did what they did as explained in the
book.
Has anyone done a similar test looking at a verticals without radials?
Thanks and 73,
Gary "Joe" kk0sd
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Jim Brown
Sent: Friday, October 16, 2020 11:51 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Greyline Performance antennas
On 10/16/2020 6:40 PM, Larry B. via TowerTalk wrote:
> I believed their PR copy that radials were not needed.
A point of clarification. There ARE a number of monoband and multiband vertical
dipoles with decent performance, and as a class of antenna, vertical dipoles do
NOT need radials. Most of them use some form of loading and lots of matching
tricks. Hy-Gain AV-series and Cushcraft R-series are vertical dipoles. First
rate antenna designer N6BT has designed a lot of vertical dipoles, first for
his Force 12 company, and for his current company, Next Generation Antennas.
There are several tutorials on vertical antennas on my website.
http://k9yc.com/VerticalHeight.pdf
http://k9yc.com/AntennaPlanning.pdf
N0AX, since 2010 the editor of the ARRL Handbook and Antenna Book, and K7LXC,
master tower climber, performed setup and on-air measurement of a dozen or so
verticals and about that number of multiband Yagis, and produced excellent
reports. Their test methods were excellent, and so were their written reports.
They can be purchased online from K7LXC's website, Champion Radio. I strongly
recommend both.
I also strongly recommend N6BT's "Array of Light," which is a sort of
compendium of several years worth of his technical writing about antennas, and
includes details for several dozen of his Force 12 designs. It's particularly
good on antenna theory, design concepts, and at debunking deceptive advertising
claims. Tom's book is now sold by ARRL.
73, Jim K9YC
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