Basic Qualification · B-006 Feedlines and antenna systems · B-006-010-004
Why is a five-eighths wavelength vertical antenna better than a quarter-wavelength vertical antenna for VHF or UHF mobile operations?
- A Because it has a high radiation angle
- B Because it does not require impedance matching
- C Because it can handle more power
- D Because it has more gain
Correct answer: D — Because it has more gain. From the official ISED question bank, verified word for word.
Why
A five-eighths wavelength vertical antenna concentrates more signal energy toward the horizon compared to a quarter-wavelength version, which spreads energy more evenly in all directions. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.