 The 1480 AM frequency was originally the home of WISM, which was known for its long-time Top 40 and later automated oldies formats.By the mid-1980s, WISM would change its call sign to WTDY and adopt a mixture of news, sports, and music before becoming a full-time talk station.By the late 1990s, the call letters at 1480 would change to WTDA, as WTDY prepared to move to its new Extended AM home at 1670 AM, temporarily simulcasting at both signals.