That's the nature of 80 GHz, design the links for your climate and don't try to go more than 2-3km. You can achieve five nines. And yes, run a 5.x GHz backup path in parallel.
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> You can achieve five nines.
As long as nobody pilots a drone in the path.
It'd have to be a big ass drone, I have links that stayed up when a Canada goose was sitting 2 ft directly in front of the 60cm antenna on one end.