Thanks for the gain analysis. Concerning the Moxon, I have an idea to use a vertical Moxon that is supported on a single bamboo pole (it's easy to buy very long, straight bamboo poles over here!).
A single pole vertical Moxon would normally mean that a crossbar would need to be mounted at the top, center (to support the coaxial feed) and bottom of the pole, in order to support the antenna wires and to maintain the rectangular shape.
The lower 2 cross beams should mechanically be strong, since the bamboo center pole would be rigid at these lower heights. But the top crossbeam would be secured to the thinness part of the center pole, and I guess that guy wires would be needed.
But what about this idea?
Build a Moxon where the bottom and center crossbeams are as before. But remove the top crossbeam and instead run the antenna wires directly from the center crossbar to the tip of the bamboo pole, similar to an inverted V. This would require an increase in the overall length of the antenna, since the wires now follow the hypotenuse of the triangular layout at the top, rather than following the two shorter sides of the triangle.
The advantage would be a reduction in wind load. The antenna wires would also now act as guy wires to support the tip of the vertical bamboo pole. Additionally, since those guy wires form part of the antenna itself, the whole antenna can easily be rotated without mechanical interference. Mechanically, it would be very easy to construct this type of 'inverted V' Moxon.
How do you think this layout would affect the electrical performance of the antenna?
So the layout would look something like this:
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