Most of the sites I found have a external antenna to plug into your "car adapter" and then it plugs into the antenna on your car (FM).
I can't use that.
I need a portable antenna with a magnetic base that plugs right into the cell phone itself..... I switch cars too often for one, and two, I don't think the Police Department wants me ripping apart the dash on the Police Car to install a FM modulator external cell phone antenna.