There's no one answer as each station can opt for one of several data rates. Many groups have talked about data rates if 25 MB/s. That might let a station do 3-4 1080 HD signals, several SD sub channels, and an SD mobile service.
I believe that few stations will opt for 4K, as it's hard to see much difference, especially if the camera uses a 4K sensor and down converted to 1080.
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