> (I don't think cable TV is broadcasting all their channels either, I don't know how they do it in practice) Actually they do. Just a whole lot of MPEG-PS, se

> (I don't think cable TV is broadcasting all their channels either, I don't know how they do it in practice) Actually they do. Just a whole lot of MPEG-PS, several of which multiplexed into a single frequency channel (sometime called transponder channel, even in the context of cable, although the term comes from satcom), and then on the order of hundreds of frequency channels between 100MHz to 1000MHz (roughly speaking, it depends on the regulatory domain, frequency allocations, and doesn't stretch all the way to the limits of the range).