Plain-language answer: Antenna bandwidth is the frequency span over which a chosen requirement remains acceptable—such as SWR, gain, pattern, efficiency, or impedance.
Why it matters at the radio
There is no single bandwidth without a criterion. A range that keeps SWR under 2:1 may not preserve the same pattern or efficiency.
What to watch in the field
State the threshold and measurement plane, then sweep beyond the desired operating segment. Recheck after final installation.
The common misunderstanding
Quoting “wideband” without saying what stayed within limits.
Learning boundary
This lesson explains established radio and antenna practice. Current regulations and the exact equipment or antenna guide control legal limits, ratings, compatibility, and safety.
