Discussion
How can a specular ground reflection be avoided on a link?
Answer: C
The geometry fixes where the reflection occurs, so adjusting the antenna heights can move that point onto broken ground, vegetation or a screening ridge where no coherent reflection forms. Space diversity is the alternative. Power cannot fill a cancellation null, lower frequencies reflect at least as strongly, and tilting the antennas costs gain on the direct path without removing the reflected one. Moving a problem to where it does not matter is often cheaper than fighting it.
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