The Big HDTV Secret: Satellite vs Cable
HDTV broadcast signals are not all the same because compression levels vary depending upon how it is received. Compression is using technology to shrink the file size or in this case the stream while trying to preserve picture quality. Compression affects fast motion the most such as sporting events or action shows.
Currently, the highest quality signal is provided directly from the broadcast TV stations over “old-fashioned” antennas. One misunderstood fact is that there is no such thing as an HDTV antenna. Antennas used in the 1950s will work just as well, if the same condition and style, as a modern antenna.