Which channels offer 4K content on YouTube TV?

As of the last update, YouTube TV offers a limited selection of 4K content through its optional 4K Plus add-on package. Subscribers who pay for this additional service can enjoy 4K Ultra High Definition on certain live sports, on-demand content, and DVR recordings. However, the availability of 4K content doesn't apply to all channels or programs and largely depends on the specific event, show, or movie being broadcast in 4K by the network. Some of the networks that occasionally provide 4K content include sports broadcasters and premium networks, but for the most comprehensive and updated list of channels offering 4K content on YouTube TV, it's best to refer directly to YouTube TV's official announcements or their website as offerings can change with time.