Depending on the type of cable service you have, you may be able to get a wireless "cable" box. Comcast will be offering them soon. But, if you want to run your own cable, I would recommend that you not try to route it in the attic and inside of a concrete block wall. Run the cable from the main panel in the garage, along the exterior wall, and drill a hole through the exterior wall. This is really not very difficult, and you can easily seal the holes with caulking.
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