[TowerTalk] What kind of antenna is this?

[Al Kozakiewicz]

https://en.wikipedia.org/wiki/T2FD_antenna ?

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Kevin Zembower via TowerTalk
Sent: Monday, May 23, 2022 2:54 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Fwd: What kind of antenna is this?

There's a drawing at

https://www.dropbox.com/s/8omfop6trejx211/IMG_20220523_144427650_BURST000_COVER.jpg?dl=0

despite my very limited artistic talent.

-Kevin
KC3KZ



-------- Forwarded Message --------
Subject: What kind of antenna is this?
Date: Mon, 23 May 2022 12:22:01 -0400
From: Kevin Zembower <kevin at zembower.org>
To: towertalk at contesting.com

Hello, all,

At Hamvention, I saw a couple of antennas that seemed to be part of a multi-band hex-beam. They consisted of two rings about 2 inches in diameter, separated by about 3 feet, with 5 parallel wires between them. 
On closer inspection, it seemed like a single wire double back and forth between the rings. I've also seen a similar arrangement on Naval ships, albeit much larger. They're mounted horizontally and seem to be fed from either end. The literature on the sales table might have referred to this as a 'Short 40.' The table was busy, and I didn't get to talk with the sales representative about it.

Can anyone tell me the type or name of this antenna? Can it be modeled with NEC? What are it's characteristics, advantages and disadvantages?

Thanks so much. Looking forward to learning more.

-Kevin
KC3KZ

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