[TowerTalk] Low over ground beams : Moxon vs Jungle-Job

[David Gilbert]

If the Jungle-Job is horizontally polarized, you're kidding yourself if 
you think there is any significant difference in takeoff angle if both 
antennas are at the same height above ground.

73,
Dave   AB7E


On 8/7/2014 8:48 PM, Yan (XV4Y) wrote:
> Hi,
>
> I want to build a portable antenna for 20m. This antenna will be installed temporarily at a low height, around 3m above ground (10’).
> I’ve modeled two antennas in MMana-GAL and compared their gain : one Moxon, one Jungle-Job (G4ZU).
> The Jungle Job is a clear winner, showing almost no degradation in its gain diagram from a « high location » (above 1/2 lambda).
> On another hand, the Moxon shows a drop of 3dB in max gain, and the max gain is at 60° elevation, versus 22° for the Jungle-Job.
> At 10°, the Jungle Job still has 7,4dBi gain, while the Moxon shows a -2,3dBi loss…
>
> The diagrams are on my blog.
> Don’t worry about the article in french, it does not contain more details than the diagrams.
> http://xv4y.radioclub.asia/2014/08/08/antenne-directive-portable-proche-du-sol-comparaison-entre-jungle-job-et-moxon/
>
> 73,
> Yan.
> ---
> Yannick DEVOS - XV4Y
> http://www.qscope.org/
> http://xv4y.radioclub.asia/
>
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