We had Dish TV at our home in NH and a second antenna with the RV. On two of our RVs we cut a hole in the roof and mounted a Dish antenna on the roof. Once we bought a
fiberglass trailer we used a tripod outside the trailer.
We used Dish and a sat dish to get TV for the first 9 years of our travels. At the time Dish provided connection to national networks ABC, CBS, NBC. Direct has a similar deal, Dish no longer provides national network channels but will connect you to local national networks when you call and give your position/zip code.
Sat TV is expensive. We gave it up and now use Internet TV and our Hotspot. We do have Sling TV over our Amazon Fire stick and both a Chromecast fire stick.
In FL we use one of those 'sheet of paper sized' antennas to get local channels. There is also one available from RCA that can be mounted on a piece of plastic pipe to get all the locals.
The Sat dish is nice because to matter where you are, places far from local, you can get perfect reception (as long as you're not in a forest.
If you have any specific questions feel free to ask.
Our Internet is a Verizon 3G hotspot and most of the time is adequate for our TV.
We've become captured by Netflix and love to be able to watch 8 years of a program in a month. Imagine reading a book over 8 years. These series are so much better watched more quickly,