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!"
1080p TVs all have scalers that can scale 480i, 480p, 720p, and 1080i to 1080p. Mine can even do PC resolutions of 640x480, 800x600, 1024x768, 1280x1024, 1600x1200, 1280x720, 1280x768, 1680x1050, 1920x1080 and 1920x1200
true but the need for this item would be beneficial if it scales better than your set.