Do you need a high definition TV if you have digital cable?

Using HD TVSome satellite and cable networks do broadcast 720p HD, at this stage there are no full 1080 HD broadcasts. You need to live in an area where this service is provded and you'll need to pay a subscription fee and you will need a digital receiver with an HDMI output to your TV.

Also, you can watch analog or non-HD digital programing on a HDTV. To enjoy the better resolution that HD offers, you need to get HD signals from somewere: Free HD broadcasts with an antenna, HD cable, HD satellite, HD/BluRay DVDs...