No ground? hrm...
Oh yeah, on our cars (at least my car, lol) you need an antenna adapter b/c the antenna must carry power - my cd player works only when the antenna is plugged in, but gets no power w/o it - but in my Corolla I ran it w/o the antenna for about 2 months before I realized it wasn't connected (say what you want about Jensen - the tuner on the CD330X is one of the best I've ever heard - and I got the deck for $50...)
And if you haven't cut your wires, go get a wire harness now - I cut the wires in my Corolla, and even though the deck worked, it was blowing fuses like crazy, so I had to resort to the worst thing possible - pay a shop to repair my mistake! I paid $15.99 for my wire harness & $14.99 for my antenna adapter, not bad considering it was the only place in the area that carried the parts for a B13.