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

[Yan (XV4Y)]

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.
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Yannick DEVOS - XV4Y
http://www.qscope.org/
http://xv4y.radioclub.asia/