Basic Qualification · B-006 Feedlines and antenna systems · B-006-011-004
What is the approximate length of the reflector element of a Yagi antenna for 28.1 MHz?
- A2.54 metres
- B2.67 metres
- C5.34 metres
- D10.68 metres
Correct answer: C — 5.34 metres. From the official ISED question bank, verified word for word.
Why
A Yagi antenna's reflector is slightly longer than a half-wave dipole, which for 28.1 MHz calculates to roughly 5.18 metres. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account