After getting my new high-definition televisions set, I initially had problems with quailty on the digital channels. The picture would often break into blocks and the audio would cut out. I learned that this is was caused by the old, poor quality coaxial cable that was running through my walls. Years ago, the kind of cable that cable companies ran was called RG59, which only has two layers of shielding. This can allow interference to leak and interrupt digital channels and make analog channels look fuzzy. Installing RG6 coaxial cable by Monster remedied my problem - it has four layers of shielding that further works to prevent signal interference or loss. Running new cable can be easy or hard depending on whether you know what you are doing or not. After it was installed, my digital channels were instantly clearer and not breaking up. RG6 grade coax is more expensive because it takes more materials to make, but it is something you absolutely have to buy in order to make your HDTV viewing enjoyable.