The Channel Master is a good distribution amp. Be sure to put a
75 ohm terminator on any unused ports.
By the way, you can buy 10 ft lengths of
galvanized electrical conduit at your local home supply store. They are great for antenna masts and would get you up a bit higher than your sat dish mount. Use a size of conduit that would fit either inside or over the sat dish pole and drill a hole through both to bolt it in place.