Although cheaper than the premium alternatives offered by satellite TV or extended packages from cable companies, basic cable still carries many of the major programs. And just because a user may be paying less for a smaller package, doesn't mean he or she isn't entitled to a clear, high-resolution picture. If the picture isn't clear, it could come down to several factors, all of which can be resolved fairly easily and with a low cost.

Talk to the Cable Company

The fuzzy picture could be the fault of a mixed or damaged signal. Having a cable technician sent over by the cable company look at the line is always an option. Don't feel like you are burdening the company with you problems. It provides a service you pay for, and if the service isn't meeting your standards, let it be known. The cable company can boost the sign from its relay station. This should allow less distortion from crossed signals into your cable box. In general, this is at no cost to you. Ask whether it offers any high-definition channels (assuming your TV is HD capable). Many basic cable packages still offer an HD option at no raised cost. Many of the channels that they carry in the basic cable package (all the broadcast networks, food network, discovery, etc.) have HD channels that will be extremely sharp and clear.

Connections

The connection from the cable box to the TV plays a large part in the picture quality. If you are connected with a lower quality line such as s-video, RCA component (the red-yellow-white plugs) or coaxial, you are getting a lower quality signal. See if your TV has an HDMI or component input. This will be the much sharper option and is essential if you are trying to get HD programming. Most likely, any cable box that a cable company gave in the last five years will have the alternative higher quality inputs.

Buy a New TV

An expensive option at at glance, perhaps, but it's the best way to ensure lasting quality and compatibility with the changing TV market. And many plasma screen televisions (which are all HD capable) are dropping in price.

Source:

HDMI.org: High Definition Cables Information

Officialusa.com: List of Cable Companies in USA