Which of the following statements about a VHF vertical antenna is true?

Correct Answer: Option A — The longer a VHF antenna the greater the signal gain.

Increasing the physical length of a VHF antenna, often achieved through collinear design, narrows the vertical beamwidth and concentrates more energy toward the horizon. This increase in effective gain improves signal range and reliability, which is a fundamental principle of antenna theory applied to maritime VHF radio installations.