Discussion
What does it mean if a pattern feature stays fixed in space as the antenna is rotated?
Answer: B
A genuine antenna feature moves with the antenna, so anything that stays put in the room must be produced by the range, the mount or an external interferer. That observation converts a puzzling pattern into a localisable fault. A slipping positioner would show no rotation at all rather than a fixed feature on a rotating pattern, and a receiver fault would not produce an angularly stable artefact. Asking what a feature is attached to is the quickest route to its cause.
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