Discussion
Why is an antenna measured at several frequencies across its band?
Answer: C
Every antenna quantity changes across its operating range, and a specification is written over the band rather than at a point, so band edges and centre are measured as a minimum. For a broadband antenna many more points are needed. Calibration is performed across the range, no universal three frequency rule exists, and averaging across frequency would conceal exactly the variation being sought. A quantity that varies must be characterised over the range in which it is used.
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