PBS makes great content with zero ads, aside from a five second blurb about "our sponsors and viewers like you" between shows. They also broadcast over antenna,

PBS makes great content with zero ads, aside from a five second blurb about "our sponsors and viewers like you" between shows. They also broadcast over antenna, so you don't even need a cable subscription to watch it (and conveniently, if you only have antenna, you're spared from all the garbage and only get PBS + local news).