Discussion
What is the bandwidth of an antenna?
Answer: D
Bandwidth is the span over which some named parameter stays within limits, most often the standing wave ratio below two, but sometimes gain, beamwidth or polarisation purity. It is meaningless without saying which parameter and which limit. Thick elements, cages and folded arrangements all widen it. The other options describe no standard quantity: radiation exists at every frequency to some degree, and reactance appears everywhere except at resonance.
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