WiFi is the most reasonably low cost option, but you do need to have good equipment to pull wifi signals out of the weeds. Most wifi in campgrounds is basic and not good for streaming to your TV, and only reliable enough to check your email. You can, of course, set up a wifi hotspot providing you have the proper equipment to do that. For TV, you could use a Roku or Amazon stick, but these are basically designed to use at a stationary location such as your home with central router in place. Moving around with these devices is not a reliable option most of the time.
Satellite is by far the most efficient, and the most expensive option. It can be quite pricey depending on who your provider is. Dish network offers the best deals while Hughes can be a challenge to your bank account. The biggest problem is that you have to buy all your equipment. This can range anywhere from $500 to $2500 depending on the type of equipment you get, the service you want, and where you live. If you already have Dish network service in your home, you can add it to your rv for minimum cost, but you still need to buy equipment, dish antenna and router, in order to use it.
Of course, the cheapest option is to stick an OTA (over the air) antenna on you rv and take your chances with channels. And, of course , this option is no good for internet service. You could make a hotspot with your phone's 4g or 5g network, but unless you have a unlimited data account, you will use it all up very quickly. In some locations you won't even get a connection.
It all boils down to money. The more you are willing to spend, the better and more reliable the service.