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this is a STOCK xm radio antenna. I have one on my 08 touring, and it came with free xm radio for a year. And yes, if you subscribe to xm radio, you should be able to listen to it through that antenna.
My 2008 touring came with it with the Bose head unit with satellite. I swapped my headunit and don't have satellite now. My understanding is the stock satellite antenna won't work on an aftermarket unit. But I'm sure someone on here would be able to wire something!
like every one said it is a satellite radio antenna. I had one mounted to the strut bar in the back that ties the two rear shocks together. the man I bought the car from had a stand alone unit in the flip up cubby hole in the dash. he sold me the car with all the wires still in the car he just took the unit. he even left the mount for it.