Just unboxed and hooked up my new LG LSS-3200A Sat receiver. Still have the "old" round dish up outside (single LNB /wdual feed). Anyway, checked signal strength thru the receiver setup and it shows that I am getting 92-98 on all 3 sats w/this old dish. Question: Do I really need the 18x20 w/triple LNBs? Am I interpretting the signal strength numbers incorrectly? Can a single LNB pickup up all 3 sats? Thx in advance. And I am getting the HD channels-no sound yet though!! Will subscribe when I get new monitor!!