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What seems to be the problem with the Antenna and the Sirius/XM radio?
Have you completed the activation for it?
Perhaps Sirius needs to perform a reset on the signal to it... you might want to give them a call and ask for that to be done.
Was the Sirius XM satellite service (or whatever is not working) on the radio or speaker dock, formerly working? or is this a first-time attempt to get it working?
Please tell me more about the problem. Thanks.