I got this dish from Oasis on Amazon as well as the receiver to take along with my RV. Got 90+ on 101, 110 and 119. Mid 50's on 99s but nada on 103. Get "771" code when selecting HD channels. I've "dithered" and tweeked till the cows came home. Looking at the diag channels (99xx) and 119 odd or even report "multiswitch problem". Oasis tells me it is still an aiming problem. Any way to verify the LNB is bad?