Start here: Antenna Q compares stored reactive energy with energy lost or radiated per cycle and is closely related to resonance sharpness and potential bandwidth.
Why this changes a real station
High-Q antennas can have narrow bandwidth and high internal voltage or current; low Q may reflect useful radiation, intentional loading, or simple loss.
What it looks like in practice
A compact antenna that tunes sharply may demand careful adjustment, but a broad SWR curve can also be broad because resistance loss is high.
What to do next
Interpret Q together with radiation efficiency, matching network loss, bandwidth definition, and the complete installed environment.
Evidence boundary
Keep frequency, reference plane, antenna geometry, losses, measurement method, and safety conditions attached to the conclusion. A match, a DC check, or one field symptom does not prove efficiency or identify the complete RF path.
