G9B01:

What is one disadvantage of a directly fed random-wire HF antenna?

  1. It must be longer than 1 wavelength
  2. You may experience RF burns when touching metal objects in your station
  3. It produces only vertically polarized radiation
  4. It is more effective on the lower HF bands than on the higher bands

G9B02:

Which of the following is a common way to adjust the feed-point impedance of a quarter wave ground-plane vertical antenna to be approximately 50 ohms?

  1. Slope the radials upward
  2. Slope the radials downward
  3. Lengthen the radials
  4. Shorten the radials

G9B03:

Which of the following best describes the radiation pattern of a quarter-wave, ground-plane vertical antenna?

  1. Bi-directional in azimuth
  2. Isotropic
  3. Hemispherical
  4. Omnidirectional in azimuth

G9B04:

What is the radiation pattern of a dipole antenna in free space in a plane containing the conductor?

  1. It is a figure-eight at right angles to the antenna
  2. It is a figure-eight off both ends of the antenna
  3. It is a circle (equal radiation in all directions)
  4. It has a pair of lobes on one side of the antenna and a single lobe on the other side

G9B05:

How does antenna height affect the horizontal (azimuthal) radiation pattern of a horizontal dipole HF antenna?

  1. If the antenna is too high, the pattern becomes unpredictable
  2. Antenna height has no effect on the pattern
  3. If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional
  4. If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated

G9B06:

Where should the radial wires of a ground-mounted vertical antenna system be placed?

  1. As high as possible above the ground
  2. Parallel to the antenna element
  3. On the surface of the Earth or buried a few inches below the ground
  4. At the center of the antenna

G9B07:

How does the feed-point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below 1/4 wave above ground?

  1. It steadily increases
  2. It steadily decreases
  3. It peaks at about 1/8 wavelength above ground
  4. It is unaffected by the height above ground

G9B08:

How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?

  1. It steadily increases
  2. It steadily decreases
  3. It peaks at about 1/8 wavelength from the end
  4. It is unaffected by the location of the feed point

G9B09:

Which of the following is an advantage of a horizontally polarized as compared to a vertically polarized HF antenna?

  1. Lower ground reflection losses
  2. Lower feed-point impedance
  3. Shorter radials
  4. Lower radiation resistance

G9B10:

What is the approximate length for a 1/2 wave dipole antenna cut for 14.250 MHz?

  1. 8 feet
  2. 16 feet
  3. 24 feet
  4. 33 feet

G9B11:

What is the approximate length for a 1/2 wave dipole antenna cut for 3.550 MHz?

  1. 42 feet
  2. 84 feet
  3. 132 feet
  4. 263 feet

G9B12:

What is the approximate length for a 1/4 wave vertical antenna cut for 28.5 MHz?

  1. 8 feet
  2. 11 feet
  3. 16 feet
  4. 21 feet