Since you're not heavy TV users, there may be another solution-
Depending on what you want to watch, many of the broadcast stations now have their own internet streaming service. In addition, with a good digital tv antenna you can pick up broadcast and local stations. And if it's movies you want, Netflix, VuDu, Hulu plus other streaming services are also available over the internet.
Now days, I'm actually using Netflix and the broadcast stations streaming services more than our Dish service.
That being said you will need good WiFi at the campground and hope they aren't throttling the bandwidth for heavy users. We see this happen from time to time usually around 4pm to 7pm when lots of folks are using the internet/WiFi.