There are three types of signals your TV can receive using an antenna or

cable without a box:

Answer:

My TV is receiving a True HD signal but still doesn't display a high quality picture.

My TV is receiving a digital SD signal instead of a True HD signal.

My TV is receiving an analog SD signal instead of a True HD signal.

To improve picture quality, follow these steps:

Check if the channel you're watching is an HD channel provided by your cable/satellite provider.

Ensure that your TV is tuned to the HD broadcast of the channel.

Confirm if the program on the HD channel is actually recorded in HD; True HD programs fill the entire screen without distortion or bars on the sides.

Consult your TV manual for instructions on how to optimize settings for HD viewing.