@furke

Do you already have the HD package or not? If you don;t have the HD package you are just going to get over the air HD channels like FOX, ABC, MSN ...

You need to have the HD package from your cable provider to get those channels.

Other thing you can do, though not recmommended is , go to the distribution box for your cable provider and find out which one co-ax serves you and remove the filter. Cable provider distributes all channels and depending upon your subscription they use filters to remove the channels you are not paying for.