It's UHF, ultra high frequency. UHF television began in 1952. Before that time there was only VHF, Channels 2-13. UHF was channels 14 thru 83. Of course all of this went away in the US with the digital conversion which completed about 10 years ago. It met a lot of resistance but is now seen as one of best things the FCC has ever done for television.Color was well established by the time I was born, but we did have 2 black and white portables when I was young. One even had a UFH channel that would pick up if you played with the knob and the weather was just right. Never crystal clear but good enough to see more image than snow. We always had cable so they were more a novelty for when camping and such.
My dad said little battery power TV's were all the rage when he was in school because they would let students bring them to school during March Madness to watch games during lunch, etc. Of course he also said a lot of the teachers would just check TV's out from the resource center and they would watch them in class while they were doing an "in-class reading assignment" those days.