Why are some channels pixelated and others not?

Some channels are pixelated due to issues with the signal quality, such as interference or weak reception, which can cause the image to break up. Additionally, certain channels may use lower compression rates or different broadcasting standards, resulting in clearer images, while others may be compressed more heavily, leading to pixelation. Lastly, the type of content being broadcasted and the channel's bandwidth allocation can also affect image quality.