There are two things here:
- a lot of "Android TV" boxes ship with an app which knows (and sometimes it's even updated) with web links for TV programming around the world. That is, instead of you going to your TV channel' web page, you could use that app.
The boxes you're linking to are satellite receivers as well. For sure, there are plenty of un-encrypted TV channels one can get with proper equipment (satellite dish pointed in the right direction), but don't expect miracles.