Go
here, then click on the NYC link to reveal all the stations. You'll see at this point the affiliation of the main channel (the // means "parallels," or repeats the station listed.) Clicking each station will reveal the list of sub-channels and what they carry. You can expand then all at the same time if you wish.
BTW, RTV is on WSAH and, yes, there are a lot of blank subchannels on a couple stations.