When was the last time WCBS-TV signed off the air for the night on a regular basis?
The "Vertical Hold" double entendre, and the "Hi High" ambiguity were clever.
Then of course, the Ariel Aerial dichotomy.
When did TV sets stop having an accessible Vertical Hold control? I remember that they became less accessible and prominent in the late 1970s to early 1980s. As a DXer, you did sometimes have to fool around with the Vertical Hold to stabilize a weak signal.