Ku band satellite uses a dish, usually an offset, and usually smaller than a C-Band dish. It must be aimed at satellites up in space just like C-Band. Ku band is just on a higher set of frequencies than C-Band.
It must also must be line of site to the satellite, in other words nothing can be blocking the signal, ie. trees, buildings, mountain, etc.
Regular antenna TV is aimed at broadcast towers on the ground. These do not have to be line of site.
Of course you are familiar I'm sure with regular broadcast TV, all of your NBC, ABC, etc, etc. Also limited to 100 miles or less of range.
With a satellite being apporx. 23,000 miles away. A TV station can aim a dish at the same satellite in CA as someone in NY.
So someone can up-link a feed say a ball game and then TV stations all over the country can tune it in and then rebroadcast over their NBC, ABC, etc.......or cable companies pick it up and distribute it over their cable system.
Ku-band can have Network channels, but as far a FTA it is mostly temporary feeds, like the ball game I mentioned after the game is over the transponder goes dark.
Same with breaking news, and special events, etc, etc. There are are some full time religious and foreign programming and a few others.
This applies the same for C-Band, feeds come and go with a few things that are semi full time. I say semi, because they could be there for a few months to a year or so and then disappear without warning.
It is part of the hobby and the fun to just see what you can find.

Go to sathint.com or lyngsat.com and look though the channels for the free channels and you will see kind of what is there.
Remember if you are looking at these sites not everything you see is free, just the ones that are designated as such.