635d Radio Antenna

[rawky]

Hi There,

I'm asking for a friend about his new 635d's radio aerial. He lives quite remotely, and his old 645 used to pick up all of the stations at his house. His new 635d does not find stations until he gets much nearer to town. He's taken it to BMW and they can't explain it, does anyone know how to make it more powerful or what to do to get a stronger signal? Can you get an aerial booster perhaps?

All help appreciated
Simon