As said above things come and go, and what's there today might not be there tomorrow, however contrary to what has been said above, all 4 major networks are available in HD 24/7 on Ku if you have the right receiver and LNBFs, you just have to know where to find them, and no, I won't say where, and I don't claim to know where they all are, just a few. The direct from network things are getting harder to tune, most are on C-band, and many use modes most of us can't get, but in general there is lots of HD up there in all the categories you mention, on both C and Ku. Ie networks, sports, wildfeeds, although backhauls like we used to see are rare, but there are some. More and more though, they are going to DVB-S2 and MPEG-4, and some feeds are using parameters that some of the DVB-S2 can't tune or play, so it's a constant fight to try to keep up with them.