Which of the following would increase the bandwidth of a Yagi antenna?

1. A Larger-diameter elements
2. B Closer element spacing
3. C Loading coils in series with the element
4. D Tapered-diameter elements

What is the approximate length of the driven element of a Yagi antenna?

1. A 1/4 wavelength
2. B 1/2 wavelength
3. C 3/4 wavelength
4. D 1 wavelength

How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?

1. A The reflector is longer, and the director is shorter
2. B The reflector is shorter, and the director is longer
3. C They are all the same length
4. D Relative length depends on the frequency of operation

How does antenna gain in dBi compare to gain stated in dBd for the same antenna?

1. A Gain in dBi is 2.15 dB lower
2. B Gain in dBi is 2.15 dB higher
3. C Gain in dBd is 1.25 dBd lower
4. D Gain in dBd is 1.25 dBd higher

What is the primary effect of increasing boom length and adding directors to a Yagi antenna?

1. A Gain increases
2. B Beamwidth increases
3. C Front-to-back ratio decreases
4. D Resonant frequency is lower

What does "front-to-back ratio" mean in reference to a Yagi antenna?

1. A The number of directors versus the number of reflectors
2. B The relative position of the driven element with respect to the reflectors and directors
3. C The power radiated in the major lobe compared to that in the opposite direction
4. D The ratio of forward gain to dipole gain

What is meant by the "main lobe" of a directive antenna?

1. A The magnitude of the maximum vertical angle of radiation
2. B The point of maximum current in a radiating antenna element
3. C The maximum voltage standing wave point on a radiating element
4. D The direction of maximum radiated field strength from the antenna

In free space, how does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?

1. A Approximately 1.5 dB higher
2. B Approximately 3 dB higher
3. C Approximately 6 dB higher
4. D Approximately 9 dB higher

Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?

1. A The physical length of the boom
2. B The number of elements on the boom
3. C The spacing of each element along the boom
4. D All these choices are correct

What is a beta or hairpin match?

1. A A shorted transmission line stub placed at the feed point of a Yagi antenna to provide impedance matching
2. B A 1/4 wavelength section of 75-ohm coax in series with the feed point of a Yagi to provide impedance matching
3. C A series capacitor selected to cancel the inductive reactance of a folded dipole antenna
4. D A section of 300-ohm twin-lead transmission line used to match a folded dipole antenna

Which of the following is a characteristic of using a gamma match with a Yagi antenna?

1. A It does not require the driven element to be insulated from the boom
2. B It does not require any inductors or capacitors
3. C It is useful for matching multiband antennas
4. D All these choices are correct