I have a Single LNB mobile antenna in my motorhome. It locks on DTV 101W just fine, but I only receive stations from the D8 satellite. I receive nothing from the D9S satellite. All the ODD transponders are good, but all the EVEN transponders show 0 (zero). Why am I not receiving anything from the D9S satellite. I have talked to Direct TV more than once and their tech dept is no help. Craig in CA.