Previous to this, KCUF was the call sign of a fictional radio station in Thomas Pynchon's The Crying of Lot 49. A number of internet streaming radio stations, e.g. call themselves "KCUF", and there's even a couple rock bands using the name.
Owner Simon T. Simon claims it's an acronym Keeping Colorado Uniquely Free. He also said "Those people who look at it that way are the same type of people who want to play a Beatles record backwards," he said. "'God' is 'dog' spelled backward, too."
Currently KCUF serves the 6,000 resdents of Aspen Colorado.