There are three types of signals your TV can receive using an antenna or cable without a box:

• Digital High Definition (HD)
• Digital Standard Definition (Digital SD)
• Analog Standard Definition (Analog SD)

The type of signal your television receives has a large impact on the quality of the picture you see. If, for example, your TV is set to an HD channel broadcasting a true HD signal, picture quality will be high. If, on the other, hand, you have your TV set to a SD (Standard Definition) analog channel, the quality of the picture will be noticeably lower.

If your TV is not displaying a high quality picture, it may be because it is not receiving a True HD signal. To get the HD picture quality that your TV is capable of displaying, your TV must receive a True HD signal. True HD signals must meet both conditions below:

1. The signal must be broadcast on a High Definition (HD) channel. Your HD channels are set by your cable or satellite provider. Most channels have at least two broadcasts: one Standard Definition (SD) and one High Definition. You must have the TV on the HD broadcast.
   
   
2. The program on the HD channel must be recorded in high definition. Not every program on an HD channel is recorded in HD. Some programs are standard definition (480i, SD) that have been up converted to HD. Up-converted SD programs typically have bars on the left and right sides of the screen. All True HD is in wide screen and always fit the screen left to right without looking distorted. 

Click below on which statment best matches the conditions your signal meets.