I have a nokia hands free set up in my car, (1989 560SEL). The microphone is above the sun visor, and the speaker is in the console, behind the sliding door, facing the back of the car. I can be heard, and can hear the calls well, (after muting the loud music from the CD player!) The phone is on the passenger side of the car, hanging next to the radio. Antenna is on the top of the rear windsheild, center.
1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)