Basic Qualification · B-006 Feedlines and antenna systems · B-006-012-002
What is one disadvantage of a random wire antenna?
- AIt must be installed in a straight line, without bends
- BYou may experience RF feedback in your station
- CIt usually produces vertically polarized radiation
- DIt must be longer than 1 wavelength
Correct answer: B — You may experience RF feedback in your station. From the official ISED question bank, verified word for word.
Why
A random wire antenna lacks a balanced feed system, so high radio frequency current often travels back along the outside of your coaxial cable and into your shack equipment. 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