bad idea, RCA uses an impedance of 75 Ohms, which you fuck up when you splice the wire. I'd recommend using RG6 cabling for the video, and, if possible, S/PDIF for the audio, but in lieu of that I'd ...

You have to use a VCR, or a cable box to tune the channel, and then output to RCA. AFAIK, that dongle is for digital audio.

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