Basic Qualification · B-003 Station assembly, practice and safety · B-003-009-003
In a 3-element Yagi antenna, which is the shortest radiating element?
- A The driven element
- B The director
- C The reflector
- D The boom
Correct answer: B — The director. From the official ISED question bank, verified word for word.
Why
In a three-element Yagi antenna, the director is the shortest radiating element because it is designed to be slightly shorter than the driven element to help focus the signal forward. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.