G9C - Antennas and Feed Lines
General Class
Directional antennas: Yagi, cubical quad, loop antennas, stacking
11 questions | Updated: Dec 9, 2025
Which of the following would increase the bandwidth of a Yagi antenna?
What is the approximate length of the driven element of a Yagi antenna?
How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?
How does antenna gain in dBi compare to gain stated in dBd for the same antenna?
What is the primary effect of increasing boom length and adding directors to a Yagi antenna?
What does “front-to-back ratio” mean in reference to a Yagi antenna?
What is meant by the “main lobe” of a directive 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?
Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?
What is a beta or hairpin match?
Which of the following is a characteristic of using a gamma match with a Yagi antenna?