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!"
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I'm sorry, but "a QAM" isn't actually a technical term. The term would be "channel" or "6MHz slot".
QAM is a modulation, not a slot. OTA uses 8-VSB instead of QAM, so are you going to say KQED puts 5 channels in one 8-VSB?