Question
In which direction is the maximum radiation from a VHF/UHF “halo” antenna?
Answer Options
- A) Broadside to the plane of the halo
- B) Opposite the feed point
- C) Omnidirectional in the plane of the halo
- D) On the same side as the feed point
Correct Answer: C
Explanation
A ‘halo’ antenna is a horizontally polarized antenna for VHF/UHF, often built as a loop, and is used for mobile or portable operation. It is essentially a half-wave dipole bent into a full circle (or square).
Since it is a horizontally polarized antenna, the maximum radiation occurs perpendicular to the current flow, which is around the circumference of the loop. Because the geometry is symmetrical, the antenna radiates almost equally well in all horizontal directions, making it omnidirectional in the plane of the halo.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!