Plain-language answer: Q compares stored reactive energy with energy lost per cycle in a resonant system.
Why it matters in the antenna
High Q often means narrow bandwidth and high internal voltage or current; low Q may mean useful bandwidth or simply more loss.
What to verify
Measure bandwidth and component heating, and evaluate Q together with efficiency and intended use.
The common mistake
Treating high Q as automatic efficiency or low Q as automatic broadband excellence.
Operating boundary
Use the exact documented component, geometry, frequency, power, duty cycle, clearances, and feed/return system. Begin tests at low power and stop for heating, arcing, damaged insulation, or unstable supports.
