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G9B02:Which 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?

G9B02G9B

Which 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?

Direct answer summary (2023-2027 NCVEC pool)

The official correct answer for G9B02 is Slope the radials downward.

The key fact is Slope the radials downward. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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More questions in G9B

G9B01What is a characteristic of a random-wire HF antenna connected directly to the transmitter?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?G9B06Where should the radial wires of a ground-mounted vertical antenna system be placed?G9B07How does the feed point impedance of a horizontal 1/2 wave dipole antenna change as the antenna height is reduced to 1/10 wavelength above ground?