I will be installing the factory Sirius receiver myself (because I have NAV coming as well) and need to install my own antenna and find some place to mount it.

My dealer has said that the receiver requires a two connector antenna. I am interested in a small antenna like the Terk Mini, but it only has one connector.

What antenna should I get?

 

If you have the Nav antenna, then the antenna on the Mini "should" have the Sirius antenna built in already. If it doesn't, you'll have to get an antenna adapter to split the signals for use with a 2 input tuner. If you can't find it online, you might have to go to a mom and pop establishment to find it. But I'm pretty sure you'll be getting the Sirius antenna in the Mini if you get the Navigation.