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!"
I tried to get DirectTV to give me an HR20, but it became a big hassel for them to find one (installers showed up at my house twice with the HR21 sans OTA). After hours of frustration, I decided to forget the DVR upgrade and stay with what I had (standard HD receiver with OTA input). Maybe if enough folks call Direct TV and ask for OTA capability, the next model (HR22?)will have the OTA input.