I am just seeing this question, I don't think that I have ever answered it. Is this correct? If so the 430N is a direct plug in if you already have Sirius. The nav antenna is built into it also. I do prefer the 430N myself, It is what I have been using for a couple years now and have read about several people having issues with the 730N.
Hello Jimmy, You'll just need the 430N radio. The Sirius antenna is also the GPS antenna. I perfer the 430N over the 730N. I guess mostly because it's what I have and I see so many people that are unhappy with the 730N radio. Also the 430N has more phones that work with it's Uconnect system (which is an external module) as well as works better with the Apple products.