Question
Which of the following is an advantage of using a horizontally polarized as compared to a vertically polarized HF antenna?
Answer Options
- A) Lower ground losses
- B) Lower feed point impedance
- C) Shorter radials
- D) Lower radiation resistance
Correct Answer: A
Explanation
A horizontal antenna (like a dipole) and a vertical antenna (like a ground plane) radiate in different polarization modes, which impacts their interaction with the ground, particularly in the near field. A vertical antenna relies heavily on a highly conductive ground or radial system to function efficiently, and any imperfections in this system lead to significant loss.
A horizontal antenna, placed at a decent height above ground, relies much less on ground conductivity and its field interacts differently with the earth. As a result, horizontal polarization generally exhibits lower ground losses than a vertical antenna that is ground-mounted or has a minimal radial system.
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