1. Yeah, we don't have external antennas. My Alpine headunit has one built in.
2. It's the jack. Pretty straightforward. I forget exactly what it looks like, but it is definitely not the strongest or most stable of jacks, so DO NOT use it if you're going to be working under your car. The position it goes in is obvious if you use the handcrank and allow it to extend. It works slowly, but it works. I've been wanting to get a better one even just for emergency situations.