South Korea’s Christian Broadcasting System (CBS/기독교방송) is a nationwide radio radio network. Beginning with HLKY in Seoul in 1954 on AM, the network spread to five stations by 1961 (Seoul, Iri (now Jeonju), Gwangju, Daegu, and Pusan.) Today the radio network consists of the original AM and numerous FM outlets serviced by three network programming feeds and 13 regional stations.
Over the years they sent QSL cards for my reception reports of all five of the AM outlets. I visited all of the AM stations except the one in Gwangju.