Antenna and Aux In question for 2006 prius

We are about to take delivery of a 2006 prius pkg 3.

We note the problems with SiriusPrius and some IPOD interfaces. Sure looks like a problem with the programming of the factoryh head unit to me...

Question: Were is the FM antenna preamp located in the car? In the Radio or in the Antenna Base?

Question: Where does the Factory AUX IN located in the arm rest plug into the Radio Head Unit?

Question: IS there a way to plug into the Radio Head Unit to add a second AUX IN for use with a Sat Radio installed in the DIN slot below the CD Player.

Thanks.