I'm running a basic SiriusXM radio (XM Snap) that plugs into the cigarette lighter and outputs to AUX. I ran my antennae through the firewall and attached to the front right quarter panel. At first I had my antennae on the dash but reception wasn't greatest so I moved it to the exterior location. Much much better.
2003 BMW Z4 3.0i
2008 Hummer H3 Alpha
2015 Mitsubishi Outlander Sport 2.0