Discussion
Why does an evaporation duct matter to maritime radar?
Answer: B
Trapping in the duct carries the signal along the surface with little spreading loss, so targets are detected at ranges far beyond line of sight, though the coverage above the duct is correspondingly reduced. Both effects matter operationally. Absorption, backscatter and depolarisation are separate phenomena. A mechanism that gives more range in one region at the cost of a hole in another is a trade rather than a pure benefit, and it must be understood as such.
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