I've been thinking about getting XM Radio for the pup and was wondering about how the signal is transmitted. Is it straight from a satellite or like cell-towers. Most of the places I camp, I get little or no cell signal in the mountains and I don't want to waste my money on something that won't work when I get to where I want to use it. I went to their website and then called them. I couldn't get any info, it's like they wouldn't even consider answering my question until I bought one.