I had Best Buy install an Audiovox with a 1" square magnetic antenna that sits on the trunk. It cost about $75 for the installation (including hardware). The head fits nicely in the lower dash compartment and connects to the aux jack there. When I want XM in my house, I take it out of my quick disconnect module in the car and put it in my quick disconnect module in the house (which is connected to my intercom). The house module cost about $45 as I remember. There is no additional cost for the XM subscription.

Chuck