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I rent a lot of cars for business trips and now you can get XM and Sirrus in rental cars. I have XM in my H2 and I rent a lot with Dollar and they use Sirrus. I like the programming on Sirrus better but I do notice Sirrus has more drop outs than XM does. I do not think it is your anttena placement so much as it is the Sirrus signal. My wife and I have a 07 997 C2S Cab on order due in August.