Corona discharge, a phenomenon occurring in high-voltage systems, presents significant challenges and opportunities in fields such as power transmission, electromagnetic compatibility, and radio interference. This study investigates the effects of corona discharge on electromagnetic interference across a frequency range of 30 MHz to 1 GHz. Results demonstrate that electromagnetic interference intensity increases with higher applied AC voltages, with distinct local maxima observed in the EMI spectrum. Differences in electromagnetic interference levels between horizontally and vertically polarized electromagnetic waves were also observed. In addition, comparisons with regulatory standards revealed cases exceeding electromagnetic interference limits.