I just bought a new motor home that has a Sirius radio installed. However, I have had XM radio for years. I want to use my mobile XM radio instead of purchasing a new subscription to Sirius. I've seen where there is available a converter for using an XM antenna with a Sirius radio. But, I haven't found a converter to use a Sirius antenna with an XM radio. I don't really want to go to the trouble of installing an XM antenna at this time. It's tougher than you might think on a motor home. Any help would be appreciated.