Hello Guys,
Let me try to make my point a bit more clearer.
If you understand how beams work (phase shifts ,elements)
You also understand that any "metal" object in the same field will cause this to alter.
Now, this can be to your benefit
Adding elements, longer boom, more gain....
And we can "deal" with it like:
Interlaced multiband yagi's,
But we can not "get away" with it.
It is not easy to design a good yagi.
And all beams are designed in such a way they will work in "most" situations.
The manufacturer hasnt thougth of all those different masts sizes and lengths beeing in the same plane as the antenna.
In aspect to the moxon, as mentioned in this thread.
Yes, there migth be situations where the lack of performance due to a mast in the same plane as the elements is minimized.
But without a doubt there will be situations (most of the time) where performance drops significant.
Everybody always worries about a additional 0,1 dB...i cant see why anyone would write down its "oke" if the SWR rises the FB drops and the gain drops.
Perhaps im answering here a bit too much with a manufacturer point of view...
Can you imagine all the calls i would get: if i told the people that a vertical moxon is no problem ?
All im saying: It is not wise to put up a moxon vertical between a metal mast, performance will drop, it is difficutlt to predicut how much as each situation will be different.
There are much better solutions for a vertical beam: the cubical quad for instance.
Kind regards,
Henry
