We have a roku at home & have used it to watch ESPN many times. One main thing to keep in mind is that you have to have a cable/satellite provider login to watch it. Like others have said, campground wifi really isn't strong enough to watch the roku, especially not live TV. I've used my phone as a hotspot & watched things that way but it uses a lot of data! And you have to be somewhere with really good cell reception.
2012 Ford F-250
2012 Forest River Surveyor Sport 295