Discussion
Why is a small loop widely used as a receiving antenna despite poor efficiency?
Answer: D
The loop's deep nulls perpendicular to its plane make it excellent for direction finding and for nulling a local interferer, and at low frequencies external noise dominates so inefficiency costs nothing in signal to noise ratio. Its gain is not higher, it is strongly inductive rather than resistive, and it responds primarily to the magnetic field, which is why it is less affected by local electric field noise. The last point is itself a practical advantage.
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