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Re: [TowerTalk] Help in ID'ing an unusual antenna spotted....

Subject: Re: [TowerTalk] Help in ID'ing an unusual antenna spotted....
From: Jim Lux <>
Date: Mon, 18 Jun 2007 12:44:11 -0700
List-post: <>
At 11:52 AM 6/18/2007, wrote:
>A couple of weeks ago, we were in Hawaii for the first time, and  visiting
>the famous "Diamondhead" Crater on the edge of Honolulu.
>   There is a military installation inside the crater, and the main  tourist
>attraction is to climb the inside of the crater to the old military  bunkers
>that are built along the rim of the crater overlooking the ocean 
>and  Honolulu.
>   To get to my point, as we were leaving the crater area on a tour bus
>afterward, I got a quick glimpse of an unusual antenna that I had never seen
>   There appeared to be a couple of missing elements and a generally  rundown
>appearance.  It obviously was part of the military 
>installation,  but appeared
>to be in a state of disrepair.
>   It looked like a large "corner reflector" antenna, BUT was in the 
> HF  range
>by the apparent size of the elements, plus it appeared to be a "staggered"
>element, log periodic design.

>   It was joined together at the "small element" end, with the  larger
>elements being on the open end.

I've seen this antenna.. it's a pretty standard big log periodic 
design.  The doubled antenna increases the gain over what you'd with 
a single LPDA.  The tapered spacing makes the spacing between the 
active radiating sections more constant (in terms of a fraction of a 

There's an example of a smaller one of these in Kraus's book

Jim, W6RMK 


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