I am completing a 3.1m fibre dish. I intend to use it on IS 10 at 68.5 deg E on C band ( may be KU in future). How can I add a second LNB(C band) to get THAICOM 2/5 at 78.5 deg E. Where should I place the second one Right or left? when I'm in front of my dish. Remember I am in southern hemisphere and looking North. My coordinates are 20 deg 13 min S/ 57 deg 28 min E. Is there a formula or rule to follow. Any pics will be an aid to me.