Dunno where the OP is with that Comcast connection...mine here in SW FLA just showed:
25.4 Down 4.3 Up, which is pretty normal for late afternoons here.
http://www.speedtest.net/result/2522946651.png
I have the 'standard' CC internet/cable/phone set up. If I only got "6" from CC, I would ask them why.
Back at our western NC mtn home, a neighbor has Direct TV and a nearly worthless Hughes Net internet connection. Direct has several roving 'offers' of different net services depending on one's area, ranging from AT&T to Verizon to the dial up bad Hughes net. No tech here, but a basic VZ air card plugged into one's laptop does ~6 down most of the time...
GL, mD