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@Ex_spurt @ajsadauskas @timrichards @skribe @danielbowen @si_fuller The original allocation of frequencies for TV in Australia provided 10 channels, called, umm, 1 to 10.

When they realised in the early 1960s more regional broadcasters would start to create difficulty allocating them to frequencies that wouldn’t cause interference with existing stations within range (on a good night, I could watch TAS TV in VIC), they needed some more channels.

So three new channels were added: 0 and 11, below and above the existing frequencies, and 5A, between channels 5 and 6.