How much does the gain of an ideal parabolic reflector antenna increase when the operating frequency is doubled?

1. A 2 dB
2. B 3 dB
3. C 4 dB
4. D 6 dB

How can two linearly polarized Yagi antennas be used to produce circular polarization?

1. A Stack two Yagis to form an array with the respective elements in parallel planes fed 90 degrees out of phase
2. B Stack two Yagis to form an array with the respective elements in parallel planes fed in phase
3. C Arrange two Yagis on the same axis and perpendicular to each other with the driven elements at the same point on the boom and fed 90 degrees out of phase
4. D Arrange two Yagis collinear to each other with the driven elements fed 180 degrees out of phase

What is the most efficient location for a loading coil on an electrically short whip?

1. A Near the center of the vertical radiator
2. B As low as possible on the vertical radiator
3. C At a voltage maximum
4. D At a voltage null

Why should antenna loading coils have a high ratio of reactance to resistance?

1. A To swamp out harmonics
2. B To lower the radiation angle
3. C To maximize efficiency
4. D To minimize the Q

Approximately how long is a Yagi's driven element?

1. A 234 divided by frequency in MHz
2. B 1005 divided by frequency in MHz
3. C 1/4 wavelength
4. D 1/2 wavelength

What happens to SWR bandwidth when one or more loading coils are used to resonate an electrically short antenna?

1. A It is increased
2. B It is decreased
3. C It is unchanged if the loading coil is located at the feed point
4. D It is unchanged if the loading coil is located at a voltage maximum point

What is an advantage of top loading an electrically short HF vertical antenna?

1. A Lower Q
2. B Greater structural strength
3. C Higher losses
4. D Improved radiation efficiency

What happens as the Q of an antenna increases?

1. A SWR bandwidth increases
2. B SWR bandwidth decreases
3. C Gain is reduced
4. D More common-mode current is present on the feed line

What is the function of a loading coil in an electrically short antenna?

1. A To increase the SWR bandwidth by increasing net reactance
2. B To lower the losses
3. C To lower the Q
4. D To resonate the antenna by cancelling the capacitive reactance

How does radiation resistance of a base-fed whip antenna change below its resonant frequency?

1. A Radiation resistance increases
2. B Radiation resistance decreases
3. C Radiation resistance becomes imaginary
4. D Radiation resistance does not depend on frequency

Why do most two-element Yagis with normal spacing have a reflector instead of a director?

1. A Lower SWR
2. B Higher receiving directivity factor
3. C Greater front-to-side
4. D Higher gain

What is the purpose of making a Yagi's parasitic elements either longer or shorter than resonance?

1. A Wind torque cancellation
2. B Mechanical balance
3. C Control of phase shift
4. D Minimize losses