Probably twenty percent of Americans, at a minimum, simply don't have access to the broadband connections (and no, wireless capped at 20meg per month will NOT work) to do this.
That will change soon. The internet will come though the wireless towers. If you have a weak wireless signal, then all you will need is a repeater in the house.
There are also digital antennas. It’s just a USB you plug into your TV. Some of them can pull a digital signal from 100 miles. The beautiful thing about digital antennas is that you either have a great picture or no picture at all.