Why does cable TV use coaxial cable instead of twisted pair?

The outer layer of the coaxial cable used for cable TV has a shielding network, which can reduce interference at high frequencies, while the twisted pair has no shielding layer; then, the impedance of the coaxial cable is 75 ohms, it It matches the impedance of the input interface (input terminal) of the TV. The twisted pair cable does not necessarily match the impedance of the TV input terminal. If the cable is short, no problem can be found. However, when the cable is long, there will be a series of problems such as unclear image and interference.