Plain-language answer: Beamwidth is the angular width of a radiation lobe between specified response points, commonly the half-power or −3 dB points.
Why it changes the result
A narrow main beam improves directionality but requires accurate aiming and does not describe sidelobes, null depth, or efficiency.
What to verify
Confirm azimuth or elevation plane, threshold, frequency, polarization, and installation.
The common mistake
Quoting beamwidth without naming its plane and response points.
Complete-system boundary
Match the exact radiator, feed system, return path, frequency, height, orientation, and environment. Connector or thread fit does not establish electrical compatibility, structural capacity, or safe operation.
