We tend to stream everything with either unlimited cell service or watch downloaded content.
For live TV, I seem to see the most Dish Tailgaters out there. AT&T does includes free DirectTV live with their top tier Unlimited cell plan and probably has a bundle with their antenna as well. The nice thing about a Dish Tailgator or similar satellite antenna is you can put it anyplace on your campsite away from the trees where it can get a good view of the sky.
You’ll find campground WiFi to be very hit and miss, mainly miss. If it exists it’s usually so congested as to be nearly useless. An external WiFi antenna isn’t something I’d invest in right away unless you know places you frequent have good service.
The Mobile Internet Resource Center
has loads of info on boosters, routers, plans, etc. It’s worth a subscription at least for your first year.