"A" channels, "B" channels - good times..23A was taboo in my area. The local fire departments used it to conduct their fire department dispatch and chatter. Anytime we keyed up on 23A, they'd get in there all official like and try to run us off, didn't work. I took an old Radio Shack GP down about 10 years ago. We put it up in 1971. It was still working the day I swapped it out. Still had original Rat Shack RG-58.