Discussion
Why does the Wheeler cap method suit electrically small antennas particularly?
Answer: C
For a small antenna the two resistances are of the same order, so the difference the cap reveals is a large and well measured fraction of the total. For an efficient antenna the difference would be a small residue between two nearly equal numbers and the method would be imprecise. Physical size, bandwidth and pattern breadth are practical conveniences rather than the reason. A differential method works best when the difference being measured is not a small remainder.
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