If you want to check LOS yourself, just call DISH and get the settings for your zip code or post your zip here and we'll tell you. Then, get a 2x4 thats about 6 foot long and miter a cut in it that's just a couple degrees less than your elevation settings. Hold the 2x4 out at arm's length and make sure its standing level, then check by eyeing up the miter cut you made and seeing if you see any trees past the cut line. Just treat the miter cut like an iron sight on a gun. If you would shoot a tree, you don't have LOS. If you would fire over the tops, you're good.