[Antennas] Effective ways to use lots of land, trees and wire?

[LA7SL Nils "Peter"]

I once visited a professional site using that idea of several wire beams 
organized in a or "star"
fahion. The difference was that they were not using single band Yagis. They 
were using logperiodic
wire elements. From the size of the thing it could look like having a 10-25 
Mhz coverage or so.
Have no idea what it was used for as the site had some military 
classification at the time.
The whole system was suspended using insulators an support wires between 
adjacent antennas/elements,
and looked as some sort of a "magnum" clothesdryer of the circular type. (do 
you have them over there
in US ? :-)   ) may be an idea , but probably difficult to put up between a 
lot of trees.
Peter
----- Original Message ----- 
From: "Edward Dickinson, III" <softblue at windstream.net>
To: "'Roscoe Primrose'" <roscoe at aiko.com>; <antennas at mailman.qth.net>
Sent: Saturday, January 17, 2009 5:28 PM
Subject: Re: [Antennas] Effective ways to use lots of land, trees and wire?


> You might consider the 3-6-9 wire beam for 40 meters.  It is 3 elements.
> 33' director, 36' driven element and a 39' reflector.  I'm not sure of
> optimal spacing...perhaps about .1 wavelength.
>
> Modeling has shown me that 5 of them at 72 degrees from each other does a
> good job of coverning the compass with <3db drop between adjacent
> directions.  Yes, that's only one band.  I attempted to add other bands 
> (in
> modeling) to the array but it seems there was too much interaction when 
> they
> were in the same vertically defined area.
>
> I'm uncertain if I still have that file.  If you are interested I can look
> for it and perhaps provide other information.
>
> Possibly several similar arrays could be set up at some distance from each
> other for other bands.  Modeling might help determine the possible
> interaction between the arrays.
>
> Such a setup would require a lot of remote switch boxes and quite a bit of
> coax.
>
>
> Regards,
> Dick - KA5KKT
>
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>


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