What is a characteristic of a random-wire HF antenna connected directly to the transmitter?

1. A It must be longer than 1 wavelength
2. B Station equipment may carry significant RF current
3. C It produces only vertically polarized radiation
4. D It is more effective on the lower HF bands than on the higher bands

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?

1. A Slope the radials upward
2. B Slope the radials downward
3. C Lengthen the radials beyond one wavelength
4. D Coil the radials

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

1. A Bi-directional in azimuth
2. B Isotropic
3. C Hemispherical
4. D Omnidirectional in azimuth

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

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

How does antenna height affect the azimuthal radiation pattern of a horizontal dipole HF antenna at elevation angles higher than about 45 degrees?

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

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

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

How 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?

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

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

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

1. A Lower ground losses
2. B Lower feed point impedance
3. C Shorter radials
4. D Lower radiation resistance

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

1. A 8 feet
2. B 16 feet
3. C 24 feet
4. D 33 feet

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

1. A 42 feet
2. B 84 feet
3. C 132 feet
4. D 263 feet

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

1. A 8 feet
2. B 11 feet
3. C 16 feet
4. D 21 feet