As a huge Howard Stern fan if you miss a few seconds you might miss the entire punch line of a joke and its annoying. Unlike cell phone signals where the signal drops and you call is gone. Satellite radio just cuts in and out when you start entering an area where there is a poor view of the sky or you are on the edge of the terrestrial repeater network. I live in one of the largest most heavily populated cities in the U.S. (Los Angeles) and can't believe that I could be on the edge of a repeater network with such a large concentration of customers. After upgrading my S50 to the latest software my signal improved and I didn't need to start another web site similar to DeadCellZones.com to allow other frustrated Sirius and XM radio to complain about poor signals. Apparently a lot of other customers had a similar problem due to all of the comments below.
This coverage map does not reflect the terrestrial repeater coverage - the signal around most major metropolitan regions in the
Some people have satellite radio reception trouble if they live on the edge of a repeater signal, where both the terrestrial and satellite signals are equally strong for much of the day. If this is the case, it would likely be a good idea to shield either the side or top of the antenna with something metal to allow it easily select one signal or the other. This is likely an issue that will be resolved with newer generation radios.
This information below was found at peopleswireless.biz.
82% of the World is a Cellular Dead Zone
Satellite Coverage Maps for Cell Phones