Unlike Internet, satellite television comes under the strict purview of government in various countries(even if they don't regulate the Ads); I wonder whether an ad blocker for television would be legal. Then again, this would raise the policy discussions of when ad blocker on Internet is allowed; why not allow it for Television & Radio?
That said, I imagine a solution for this need gap would involve hardware capable of training/inference machine learning models intercepting the television feed before delivering the ad blocked content to the television.
Unlike web, where advertisements are just part of the viewable content; television ads occupy the whole real-estate and so what will occupy the place of ads would be an interesting problem to solve, maybe switching to another pre-specified channel(auto surfing) could be the solution.