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Why is the boom of the yagi antenna connected to a metal mast and electrical ground?

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Why is the boom of the yagi antenna connected to a metal mast and electrical ground?

(a) Better signal directivity

(b) Increased bandwidth

(c) Lightning protection

(d) To avoid short circuiting

I had been asked this question during an interview.

My question comes from Types of Antenna topic in division Antennas and Wave Propagation of Avionics

1 Answer

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Best answer
Right choice is (c) Lightning protection

Explanation: The centers of the parasitic elements are neutral electrically; these elements can be connected directly to the boom. For the best lightning protection, the boom can then be connected to a metal mast and electrical ground.

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