Discussion
What is a diffraction loss on an obstructed path?
Answer: B
An obstacle intruding into the first Fresnel zone removes part of the wavefront that would have contributed constructively, and the loss grows rapidly as the intrusion deepens, from six decibels at grazing to twenty or thirty when well obstructed. Spreading is the free space term, absorption in rock is irrelevant since the wave passes around rather than through, and backscatter is negligible. The loss is a diffraction effect and is computed from the geometry rather than from the material.
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