What’s going on with the radio?

Can someone explain why, in mid-Michigan, I’m pulling in “Moody Broadcast Network “97.9 WGNR out of Indianapolis, 97.9 “fm98″ WJLB out of Detroit, but can’t freakin’ get 97.9 WGRD out of Grand Rapids like I used to?  I admit, I’ve become a fan of the Free Beer and Hot Wings morning show, and up until recently have been able to reliably pull it in on the drive to work.  Of course, the signal got better as I got closer to work, but lately the Detroit station has been overpowering things the whole way.  This morning I was getting the stupid Indiana station.  What the heck??  I’d file an FCC complaint, but I don’t know if that’s the right place or not.  Maybe ‘GRD needs some more hamsters to power their station?