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!"
You're surprised? Comcrap will be the last service to get it. They mislead the public about the amount of HD (who cares about total content when more than half of it is PPV or VOD??!), and have crappy service and boxes (Comcast's UI looks like something that was slapped together 10 years ago while FIOS' looks more sleek and give you more capabilities!).