The cable run is 100 feet or less.
To answer another posters question, I have HD and just digital boxes at home, the box I took to the camper was a digital box, so I'm assuming it will work fine on his dish? Also, I looked online and was able to find the box that is up there. Its a direct tv D12 box.
Link with picture here - http://www.satelliterepair.info/shop.html
The dish under the box looks like what I have at home and what is in the campground