We do Wanapum once or twice a year. Great park-but it can be a drag when the wind 'decides' to blow. We'll probably be there sometime after 'reservation season' ends.
I'm fortunate in that it's only something like 30-40 minutes from our house
. I had reservations for Labor Day of Vantage but had to cancel when our previous trailer died (and I didn't know I'd fall into our 2720SD). I think my spot may have been the one you were in (or one near it). On the cul de sac, right hand side
BTW-I'm w/Dish also, and run the cable in just as you do, but use a portable tripod. Seems in a lot of places I end up in a spot that is too protected by trees