Thanks for the feedback. I'm waiting to hear back from the dealer... My new 2014 Silverado has been in the shop for over two weeks due to another issue: Weird sound coming from the rear of the truck! Once warmed up, a rattling/vibrating sound occurs when in a low RPM and low speed setting for the current gear under 55mph. It most often occurs between 20-40 mph. Apparently it's a bearing issue in the rear differential. Glad I spent $40,000 on a new truck to have a crap radio and drive train issues. The loaner vehicle they gave me, a Chevy Equinox, has much better radio reception by the way.
I'm going to show the dealer these posts and hope they fix the reception issue. If anyone else is having issues please reply to this thread. I'll let you know how I make out.