If your original head unit was a Sony, chances are you'll never get reception as good as that. Sonys have the best FM reception by far. It's the only brand I'll put in my wife's car as she's a radio nut and mostly uses her stereo to pull in Boston, MA stations, which is about 70 miles from home. I asked a long time ago what the FM sensitivity was on the receiver, but don't recall if I ever got an answer. My BBS searches on FM, Sensitivity and dbF didn't turn anything.

Perhaps someone can fill in the blank for the record?
RioCar Receiver FM sensitivity = ____ dbF.

-Zeke