Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
But with one major difference.
IPTV runs over a IP packed switched network which means that it can more effectively use the total amount of bandwidth. SDV runs over normal QAM channels which share a single QAM channel, (just like VOD) which usually means more bits are wasted.