Discussion
Assertion (A): Direction finding with a loop antenna uses the null rather than the maximum of its pattern.
Reason (R): The null of a loop pattern is much sharper than its broad maximum.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. A cosine shaped pattern changes very slowly near its peak and very rapidly through its null, so the bearing can be read far more precisely from the null. The price is a front to back ambiguity, which a sense antenna combined in quadrature resolves by producing a cardioid pattern with a single null. The same preference for nulls over peaks recurs wherever an angle must be measured accurately.
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