I've been on the roof now for about 2 days. Being a NEWBEE I am having troupble > I have a linear Ku lnb rated 950 MGh to 1450 Mhz. I am trying to get echostar 4 - 121 with no success. Elevation is fine 33.8 degress, azimuth 158.6 . When I am setting it up on the receiver , I can't pick up a...