The owners of those substations have every right to change what is being broadcasted. And often do without any notice. That’s where your concern should be directed. Nothing to do with Comcast, they just broadcast what is given
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Could you tell us what your Zip code is? That way, we can try and figure out which station was airing GetTV (and now DABL) in your area, and see if the problem is with the station no longer carrying GetTV or with Comcast.