When I was a kid, there was no such thing as Nickelodeon.

Really. No way to watch (shudder) Mister Ed reruns!

The concept of a "TV network" that you couldn't even pick up with rabbit-ear antennas was unfathomable.

Yep, Channels 4, 5, and 7 (oh, and 2!) NBC, CBS, ABC and WGBH. Then at some point 2 UHF stations appeared, but our TV didn't receive UHF... (Nostalgic echoes of The Old Man's grumpy "We *have* a color TV. Two colors!")