Problem with radio not picking up stations

I have a 2008 Avalanche Z71 with the bose sound system with no DVD but does have rear seat audio controls, the problem I'm experiencing is that the radio does not pick up any broadcast stations but the XM recieves signals just fine I even tried another head unit as I  am upgrading to an aftermarket navigation unit but that unit also does not recieve broadcast stations. Anybody have any Ideas

Thank You;
              awpratt79

Chec antenna cable from antenna to radio.