I have been getting some in / out reception . Antenna is on roof . I lost reception for a day and then back on again . I checked XM Status and even tho I now have reception again , it is showing " not connected" , no signal. Could it be antenna ? Also have been getting channel 1 once in a while when I start up the truck . XM unit is w/out traffic info , Z1 is May 2006 unit .