Your 3 LNB looks at 101/110/119. The 5 LNB (AT9 or Slimline) looks at the same sats plus 99 and 103. So, if you can see alright with the Phase III dish, you should be o.k. with the 5LNB. You just have to basically be able to see the 99 (as you'll have no prob with the 103).