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I'm not sure if you will be able to cleanly diplex the signals onto a single downlead. I'm not an expert on DirecTV signaling, but my understanding is that the coax signal is being carried at 950 and 1450 MHz. The top of the TV spectrum is at 700 MHz. Furthermore, the LNB on the dish needs to receive DC and 22 kHz signals to select between different frequency and polarization modes. The MS-2002 needs its own DC power on the same coax.
A single coax solution appears to be out of the question.
BTW, an MS-2002 in the attic will probably only be able to get the channels in the "green" zone on your list. The low intrinsic gain of the antenna (not counting the gain of the built-in amp) and the signal degradation you get from being indoors means that you aren't likely to get channels lower down on your list.
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