@peterh Watching all of this video may be useful. I positioned that link to be later in the video, right at the point where he demonstrates polarization effects. But watch the whole thing. It's good. Also, if you look at antennas used for moon bounce, you will see helical designs. By the time the signal bounces and returns there's no preferred polarization and a helix gets you something, regardless. Although crossed dipoles and other means can transmit right or left circular polarization, I haven't observed its use myself.
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