hi, m using coolsat 5ooo and a 33" dish with dual lnb since last 3 days i hav been trying to get signal and my directions are 99% correct but i can,t get signal quality above 7% where ever i point my dish i get same quality. but i get 81 % level. IS it a LNB issue? is it defective ? should i change it ? or watelse should i try ?