Fblex

Hello, new here. Need to know if anyone experienced this. I have a 2005 IS300 and recently changed my radio to the Pioneer AVH-8500BHS. I can't get the FM/AM Tuner to work. Crutchfield kindly exchanged the radio for me but I still have the same issue. This is a HD/Digital Radio, can it be I need to change the antenna to a stronger one? If so, can you suggest one? Would gladly appreciate a response. Thanks!

Frank...