Question
Which of the following types of antenna offers the greatest gain?
Answer Options
- A) 5/8 wave vertical
- B) Isotropic
- C) J pole
- D) Yagi
Correct Answer: D
Explanation
Antenna gain is a measure of how effectively an antenna concentrates power in a desired direction (T9A11). The Yagi antenna (or Yagi-Uda array) is a classic directional or ‘beam’ antenna designed with multiple passive elements (director and reflector) to maximize gain in a single direction.
Due to its design, a Yagi can achieve far greater gain than omnidirectional antennas like the 5/8 wave vertical or the J-pole. The isotropic antenna is a theoretical, lossless antenna used only as a 0\text{ dB} reference point.
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