Ah the old MODE button fallousy. Check build dates, google part numbers. It's the only way to be sure, Luke.

Yes that appears to need a NG antenna amp. It's an early 2001. Maybe it's only the tape units (Phillips and Blaupunkt) that need the two antenna connectors, and the CD (Blaupunkts(?) and Alpines) need one antenna? I think the Alpines have a large copper heatsink on the side.