[Elecraft] 43 Ft Vertical and Elecraft Tuners

[mikefurrey at att.net]

I have modeled this too on my old K6sti software ... need to get a windows 
replacement. Make that a horizontal 20 DEZ (86') and not only is that 
antenna lots of fun on 20 but it is lots of fun on 10 with a very nice 
cloverleaf pattern (can't remember the gain).

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From: "Ron D'Eau Claire" <ron at cobi.biz>
Sent: Tuesday, September 03, 2013 5:28 PM
To: "'Reflector Elecraft'" <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] 43 Ft Vertical and Elecraft Tuners

> An interesting point I noticed modeling a 43 foot vertical was that, while
> on 10 meters the main lobe is up around 50 degrees, the "gain" at low 
> angles
> is similar to a 1/4 wave "ground plane" antenna cut for 10 meters. That's
> because the longer antenna has significant gain over a 1/4 wave antenna so
> the amount of radiation down at the lower angles is about the same as a 
> 1/4
> wave.
>
> That's for a ground mounted 1/4 wave on 10 meters. Ideally you want to 
> raise
> the 10 meter vertical at least 1/2 wavelength - roughly 16 feet - then you
> get much better low angle radiation from the 1/4 wave because the ground
> absorbs much less of the lowest angle radiation. Installed that way, the 
> 1/4
> wave shines over the 43 footer. Also, of course, there is less 
> interference
> with the signal by foliage, buildings, etc.
>
> That's why so-called "vertical ground plane" antennas are so popular on 
> the
> higher HF bands.
>
> 73, Ron AC7AC
>
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