AM 1660 launched in the early 1990s, shortly after the Federal Communications Commission in the United States expanded the AM band to include new stations in the range of 1610 to 1700 kilocycles. It was the local Radio AAHS affiliate from 1992 to 1994. When the network folded, it did not join Beat Radio, its successor, but instead adopted a Spanish-language music format. The station, then called WBAH, also aired many New York Yankees games in Spanish.
WBAH remained a Spanish language station until sometime in the mid-2000s, when Multicultural Broadcasting purchased it. WBAH then leased the time to Radio Seoul, which had just left WNSW, 1430 AM in an effort to gain a stronger signal in the market. Sister station WZRC, which had broadcast in Korean, switched to the Chinese language at the same time.
Later, the brand changed from Radio Seoul to Radio Korea, which it is called today.
The signal can reportedly be heard as far away as the Washington, D.C. area at night.