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Why is top hat added to antennas?

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Why is top hat added to antennas?

(a) To increase capacitance

(b) Increasing the antenna gain

(c) Sideband suppression

(d) Increasing the range of the antenna

This question was posed to me in my homework.

My question is from Types of Antenna topic in section Antennas and Wave Propagation of Avionics

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The correct choice is (a) To increase capacitance

To explain: A top hat is a structure that increases the capacitance to surrounding items, bringing the antenna back into resonance. Obviously, such an arrangement is too top-heavy and inconvenient for portable and mobile antennas. However, it is sometimes used in larger fixed antennas at lower frequencies.

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