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The FM tuner is built-in to the phone. Go into Zune and tap on radio.
As for streaming from the DVR, I'm doing this through Windows Media Center. It can be used with any cable or satellite provider. I'm actually using it with over-the-air service.
With play-to, it will search for any DNLA device on your network. I use it with the Xbox 360's I have at each TV.