Discussion
What happens to a link if a new building is erected in the Fresnel zone?
Answer: A
Any intrusion into the first Fresnel zone removes part of the contributing wavefront, so loss appears even while the direct ray remains geometrically clear, and the margin that was protecting the link against rain is consumed by a permanent term. Planning consultation over microwave paths exists for this reason. Reflection can occur too but does not compensate, and polarisation is unaffected. A permanent loss eating a margin intended for a varying one is a particularly damaging kind of degradation.
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