T h s paper presents the results of long-tenn electromagnetic interference(En/lI) measurements on the bundle of 6 Cardinal conductors tested at the Kochang 765-kV 111 scale test line. The instrumentation, and the most important features of the facilities are also described This new 3-phase double circuit test line can be energized at line-to-line voltages up to 850 kV. The analysis of the data shows that the 6-Cardinal conductor bundle meets the radio and television interference guidelines of the Korea Electnc Power Corporation (KEPCO).