Twenty-four-hour broadcasts began in 1984, and a new 100 kilowatt transmitter went online in 1991, meaning that the station could be picked up across most of the Twin Cities region (Northfield is on the southern edge of the area). The transmitter was placed on land owned by the University of Minnesota in exchange for WCAL turning over its 770 AM frequency, which had been shared with KUOM for many years. Because 770 is an FCC-defined clear-channel frequency occupied by full-time station WABC in New York City, it could not be used by other stations at night; as daytime-only stations, WCAL and KUOM each broadcast an average of about six hours per day. The shutdown of WCAL allowed KUOM to broadcast the maximum amount of time allowed by the license.