Here is the way I find out what main digital channel and digital sub channels are transmitted by the Tv station. As an example , type the Tv station call sign in the Google search box like this , wtvy tv , Google will list many links to go to , the 2 main links to go to are wikipedia.com and rabbitears.info . Also there are several on line Tv guides to find out what programing is on , here is one of them ,
http://www.zap2it.com