Discussion
What sets the resonant frequency of a tuned magnetic loop?
Answer: C
The loop is an inductor, and a high quality vacuum or butterfly capacitor across its gap resonates it, tuning being achieved by varying that capacitance. The circumference sets the inductance and therefore the range covered, but not the operating frequency directly. Height affects the pattern and ground loss, and feed line length should be irrelevant if the antenna is properly matched. The extremely high circulating voltage across that capacitor is the loop's main practical hazard.
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