Coax is a single tiny copper wire. Twisted-pair will get you a hell of a lot more than coax, used properly. Please don't confuse abuse of the telephone network with twisted-pair cables being inferior to coax.
I beg to differ. Even the very most expensive cat7 cabling can't be used to distribute satellite signals, where properly screened coax can...
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A: Satellite signals are a totally different use case to normal data, operating at a very high frequency, which is very inefficient.
B: There is no such thing as Category 7 cable.