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What can be added to reduce signal ambiguity in a loop antenna?

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What can be added to reduce signal ambiguity in a loop antenna?

(a) Low noise amplifier

(b) Amplifiers

(c) Sense antenna

(d) Increase the antenna size

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The above asked question is from Point Source Radio Systems topic in portion Terrestrial Radio Navigation System of Avionics

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Right choice is (c) Sense antenna

To explain: The horizontal pattern of the loop antenna is a figure of eight which has two null positions 180° apart. This ambiguity will cause the system to give the same indication whether it is pointing toward a station or away from it. A sense antenna can be added when the signal ambiguity must be resolved.

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