Read this: Postwar broadcast coverage was extended to Birmingham in 1949 with the opening of the Sutton Coldfield transmitting station, and by the mid-1950s most of the country was covered, transmitting a 405-line interlaced image on VHF.[original research?]

On what frequency band was the BBC broadcasting in thie 1950s?
What is the answer? (If it cannot be answered, return "unanswerable")
VHF