To be frank with you Frank, if you want an Alpine XM tuner, you would need an Alpine Head Unit that is XM ready. XM pieces are proprietary in that they need to mate with the same manufacturer.
There are many aftermarket head units that are either XM or Sirius ready, but soon head units will come with a tuner built in. An antenna and activation are all that will be necessary. (Did you notice I started a sentence in which the first six words start with an "a?"
used ) I assume you have somehow acquired an alpine XM tuner?
You can find Alpine head units and all of the necessary installation materials at crutchfield.com