 But because AM 1070 is a clear-channel frequency reserved for Class A KNX Los Angeles and a now-dark station in Canada, WSCZ must reduce power at night to 1500 watts using a directional antenna to avoid interference.The station's transmitter, a three-tower antenna array, is off West Duncan Road (U.S. Route 25) in Greenville.WCSZ is one of five AM radio stations in South Carolina operating at 50,000 watts by day, the others being WESC in Greenville, WAGL in Lancaster, WBAJ in Blythewood and WCEO in Columbia.