Best to replace the cable completely. Use a decent quality 75 ohm foil screened coaxial cable and make sure you understand how to put terminals on properly.
You didn't mention the make and model of TV but if it's even halfway modern, that should be all you'll need. Post the make and model and we'll see if there's a manual available (there usually is)
There's plenty of sites you can use to check the transmitter serving your area.
Do be aware that the signal is less forgiving than old analogue TV. Error correction is ok up to a point but once signal deteriorates beyond a certain point you'll lose the program.
Ejdj
June 2022