How does it show up on a 60 Hz TV then? I thought the signal (at least on the cable, not talking RGB, which I assume has various frequencies available like VGA) had to be the same as the TV, and coincidentally the mains network (AC)

Basically is it the signal that drives the electron beam (meaning we could overclock and fry the TV), or is it the TV itself, which is fixed, and the signal should be at a certain speed, just like TV programs?