Thinking about it, if you just want an accurate line of site from various places on your property you can do that pretty easily by setting your telescope's elevation to what Dish says for your zipcode and then just putting it all the placess you want to check and then sight along the barrel of the scope using a compass to get the direction. Just remember to make sure the telescope mount is level or the angle part will be off. Now you can just look through the scope and find out if there is clear sky or not.
I did this kind of thing by just using a protractor to cut a piece of cardbord into the correct triangle then taping it to a builders level. Then I'd use a compass to get the direction and hold the triangle to my eye and peaking at the level until it was right and I was as accurate and anyone would need to check clear line of sight.
If the view is really cluttered you can put a rig like this on a camera tripod and really dial it in.