HD stands for High Definition with a clear and crisp picture. In order to receive an HDTV signal you require an HDTV with HDTV terminals to receive the HD content.
To purchase an HDTV you need to look online for HD information. HDTV terminals are available through your regular cable line and you do not need a new cable.
It is advisable to go in for a digital satellite dish with HD to get the benefit of all the high definition channels.
With HDTV, you can record digital video records to get quality images. Nowadays HD satellite receivers are available virtually free from your provider. You are also able to benefit experiencing the wide screen effect.