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Does your XM receiver use the regular antenna? Does the antenna go up and down automatically when you turn the receiver on and off (with ignition on)? If so, you can use the same technique, since the antenna doesn't care what kind of receiver you have.
Put a switch in the orange wire to the antenna relay, which is located under the rear "halo" around the hatch, on the left side. With the switch off, the antenna will stay put. With the switch on, it will be automatic.
If you want the antenna down, turn off the receiver, wait for the antenna to go down, turn off the switch, then turn the receiver back on.