 Television sets were not required to have all-channel tuning until 1964.Forced to rely on UHF to expand, DuMont saw one station after another go dark due to dismal ratings.It bought small, distressed UHF station KCTY (channel 25) in Kansas City, Missouri, in 1954, but ran it for just three months before shutting it down at a considerable loss after attempting to compete with three established VHF stations.