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for both XM and sirius you have to purchase a contact for each reciever. So if you have a different reciever in your car, home, and boat then you need 3 different contacts. Both offer discounts for multiple recievers though.
Now, from what I understand, both offer recievers that are portable and can be plugged into a kind of 'docking station' for the reciever. The docking station is cheap and connects the reciever to your car, home, or boat.
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