Basic Qualification · B-006 Feedlines and antenna systems · B-006-009-011
An antenna is said to have a gain of 4.1 dBi. How much gain is this over a half-wave dipole antenna?
- A 1.1 dB
- B 2.0 dB
- C 4.1 dB
- D 3.0 dB
Correct answer: B — 2.0 dB. From the official ISED question bank, verified word for word.
Why
A gain of 4.1 dBi means the antenna is 4.1 decibels stronger than an isotropic radiator, which radiates equally in all directions. 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.