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I mean to the point where you would turn on the television and outfits like CNN, NBC, and FOX are blank. Back in the day, when a television station was off the air, all you would see is salt and pepper.

I mean to the point where you would turn on the television and outfits like CNN, NBC, and FOX are blank. Back in the day, when a television station was off the air, all you would see is salt and pepper.

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In the past the network would transmit over satellite to the local stations. Those local stations would either immediately rebroadcast that signal while splicing in their local commercials and news, or record it and then rebroadcast it at the correct time for their timezone.

Each network still has to have that one main source. Maybe they still use satellites. But more likely it's sent across the internet. But either way, each network has to have that one source that transmits shows and content to local stations. And also has that one main source that transmits national networks (that don't use local commercials or local news) to the cable and satellite companies to be sent out on their systems.

And because many networks are linked, (for example ABC owns ESPN) there might be just one source for each - ABC, CBS, NBC, Fox, and Time Warner. Take out their main transmitter and all you'll see aired will be local news and commercials.