Basic Qualification · B-006 Feedlines and antenna systems · B-006-013-004
What is the approximate length of the driven element of a quad antenna designed for 14.3 MHz?
- A 5.35 metres
- B 21.40 metres
- C 10.49 metres
- D 16.36 metres
Correct answer: B — 21.40 metres. From the official ISED question bank, verified word for word.
Why
A quad antenna's driven element is a full wavelength loop, meaning its total wire length equals one complete wave at the operating frequency. 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.