Discussion
Why is the receiving antenna scanned in height on an open area test site?
Answer: B
The ground reflection interferes with the direct wave, so the received level varies strongly with antenna height, and the standard requires the maximum over a stated height range to be reported. Without the scan the result would depend on an arbitrary choice. It is not a pattern measurement, far field conditions are set by the distance, and environmental averaging is not the aim. Making a procedure yield a defined worst case is what allows results to be compared between laboratories.
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