Basic Qualification · B-006 Feedlines and antenna systems · B-006-012-006
What is a major advantage of an end-fed half-wave antenna (EFHW)?
- A High resistance to local noise pickup
- B Develops minimal common-mode current
- C Capable of multi-band operation
- D Matching network not needed to feed with coaxial cable
Correct answer: C — Capable of multi-band operation. From the official ISED question bank, verified word for word.
Why
An end-fed half-wave antenna works well on many different frequencies because its electrical length is a multiple of a half-wavelength on several amateur bands, allowing it to operate without needing a separate antenna tuner for each band. 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.