General exam question G9B10
Subelement G9, ANTENNAS AND FEED LINES· Group G9B
G9B10
What is the approximate length for a 1/2 wave dipole antenna cut for 14.250 MHz?
- A.8 feet
- B.16 feet
- C.24 feet
- D.33 feet (correct answer)
WhyA 1/2 wave dipole antenna cut for 14.250 MHz has an approximate length of 33 feet. A half-wave dipole's approximate length in feet is found from 468 divided by the frequency in MHz, so 468 divided by 14.250 comes out to about 33 feet, answer D. The other values don't match applying that standard dipole-length formula at 14.250 MHz.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- G9B01What is a characteristic of a random-wire HF antenna connected directly to the transmitter?
- G9B02Which of the following is a common way to adjust the feed point impedance of an elevated quarter-wave ground-plane vertical antenna to be approximately 50 ohms?
- G9B03Which of the following best describes the radiation pattern of a quarter-wave ground-plane vertical antenna?
- G9B04What is the radiation pattern of a dipole antenna in free space in a plane containing the conductor?
- G9B05How does antenna height affect the azimuthal radiation pattern of a horizontal dipole HF antenna at elevation angles higher than about 45 degrees?