“When I scan for for cable channels, on my I SIGNIA roku tv, not all channels come back HD. But on every tv in my house all channels are Hd. So why are only a few on my roku tv hd”

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• This has to do with placement of antenna more than the TV itself. Try moving the antenna round the room.

  Answered by Tamalex2004 7 years ago

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• Your best bet is to buy an antenna.

  Answered by Manny 8 years ago

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