It's coming through on comcast's signal, it's not using your coax wiring as an antenna. My sister only has the internet package and also gets the channels Terp describes, I think it's just how it's set up that they're tied to the broadband signal.
It's odd that the big 3 are coming in on the big 3 station numbers. Or maybe that's not what TF said. Is that where they come through on Comcast basic? I didn't think that any Comcast channels would come through without a set top box...
