Plain-language answer: Corona is partial ionization of air around a conductor where electric-field intensity becomes high, often near sharp points or high-voltage antenna regions.
Why it matters in the antenna
It wastes power, creates noise and ozone, erodes materials, and can precede arcing. Altitude, moisture, geometry, and voltage matter.
What to verify
Use smooth hardware, adequate spacing and insulation, rated components, and low-power testing; stop if arcing, odor, or unexplained noise appears.
The common mistake
Ignoring sharp points because average transmitter power seems modest.
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.
