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BTW there is no card reader or components of any sort in the front half of the cabinet under the TV. The DU Controller board is towards the back and the power supply board is mounted vertically, behind the VCR.
Originally the Antenna In on the unit was one of the RF jacks on the DU controller board, and the other jack on the board was only accessible internally, but the original external jack was broken off and replaced with a panel-mount jack. The panel-mount jack was connected to a short length of coax, then to the VCR's antenna input. The antenna output on the VCR went right to the TV.
My guess is originally, the external Antenna In was the DU controller jack, the other DU controller jack went to the VCR's Antenna In and there was probably an RF modulator (now missing) used for the TV (unless the Addressable Interface can transfer audio/video, which I doubt).
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