Discussion
How does angle diversity work on a fixed radio path?
Answer: D
Two beams offset slightly in elevation receive the direct and the refracted paths with different relative amplitudes, so they fade differently and combining them restores availability, at less cost than a second antenna on a taller tower. Route diversity, crossing links and polarisation diversity are different arrangements. Any dimension along which two signals fade independently can be exploited, and elevation angle happens to be an effective one against atmospheric multipath.
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