hello, i have a 1999 A4 quattro sedan, my problem is reception on my radio, the am/fm radio has poor reception, there isnt a visible antenna how do i check for reception problems? tim

 

my car has an inrernal antenna. the radio station reception is not that good. it only picks up some stations.when i switch antennas to
an ols radio control antenna it picks up many more stations and louder. what could be the problem. is there an antenna fuse or something