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Technician exam question T9A08

Subelement T9, ANTENNAS AND FEED LINES· Group T9A

T9A08

Why is a 19-inch-long vertical antenna often used on 2 meters?

  • A.It has high gain
  • B.It is a resonant half-wave
  • C.It is a resonant quarter-wave (correct answer)
  • D.It has low RF radiation exposure

WhyA 19-inch-long vertical antenna is often used on 2 meters because it's a resonant quarter-wave. At 2 meters, a wavelength is close to 6.5 feet, so a quarter-wavelength works out to roughly 19 inches, which is exactly why that length is commonly used for a resonant quarter-wave vertical on this band, answer C. It isn't chosen for high gain (A, a simple quarter-wave vertical has only modest gain), it's a quarter-wave rather than a half-wave (B), and RF exposure isn't the reason for choosing this particular length (D).

Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.

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