Question
What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?
Answer Options
- A) 45 degrees
- B) 75 degrees
- C) 7.5 degrees
- D) 25 degrees
Correct Answer: C
Explanation
The elevation angle of peak response (or main lobe takeoff angle) is the angle above the horizon at which an antenna radiates the maximum amount of energy. For HF communication, a low elevation angle is typically desired for long-distance DX.
Referring to Figure E9-2, the main lobe is the one farthest from the ground (the highest gain point shown). The peak response of this lobe occurs at an angle of approximately 7.5° above the horizon. This low angle is ideal for single-hop HF DX propagation.
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