Are you talking about when you use it in the portable mode? You have to remember that it feeds off of satellites that are in the southern sky. If you're in a building away from, or without windows, for example, you won't get a signal. I own an Inno, the older brother of the XMP3, and I find my signal changes depending upon where I am in the house. If I'm outside, I generally don't have a problem, as long as the antenna isn't covered up or otherwise blocked from the sky. There are available antenna headphones that will help.
Also, if you are new to satellite radio, I recommend you go online to the XM Satellite Radio Forum located at www.xmfan.com. You will be able to get first-hand help with any issues that may arise, including some solutions to your problem.
Thank you this is helpful. I wrote Pioneer and they said take the battery out and put it back in to reset the device. That impoved the reception, in the yard I got a break in the signal when walking under trees. I am interested in the antenna earphones can you tell me more?
These will improve your signal when you're out in the yard and will help in the house. The antenna is built into the top portion of the headset, so you don't want to wear a hat to block the signal. They take a little getting used to, but overall, I find them very comfortable. They also have a volume control on the cord. The ones for the XMP3 are very similar in design. I've included a link to a store that describes them, although you may have to do a Google search to find a better price and availability. They are a brand new item and are not available everywhere yet. They are out-of-stock on Amazon.