Hollywood_Guy wrote:
I think "terrestrial" is a European/Australia term (I live in the US). "Over-the-air" is a more common expression in North America.
I would say the more common term is BROADCAST radio/TV. Though, with the rise of satellites and things like Sirius/XM subscription satellite radio, terrestrial may be used as a point of distinction.
I remember Howard Stern was surprised that more people didn't switch over to satellite radio, but it's still impractical for the average person and much easier to use broadcast/OTA/terrestrial radio, especially in the car. And now, with streaming services, satellite radio isn't the only alternative.
With TV, the cool thing about digitization is the addition of sub-channels. Not too long ago, Cable TV was a nice luxury that offered 50+ channels, in comparison to terrestrial broadcast that could, at most, offer maybe 10 channels tops (if you lived in a major market area). And many people weren't so lucky. Now, one station may have 4 or 5 broadcast sub-channels, meaning there's more available over-the-air.
And notice how the dominant radio players ABC/NBC/CBS in the USA became the dominant TV players, and to this day most major programming is still broadcast related.
So, I think terrestrial TV and radio are still quite prevalent.