I recently purchased a 2006 Chevrolet Silverado. When I get up to 60-75 mph I hear a noise that seems to come from the roof antenna. It sounds like a wire "flapping" above the driver side. I do not feel any air coming from the area, but I have a feeling air may be coming in between the roof and roof antenna. As a disclaimer, I do have rainshields on the windows, maybe that may be the source. Just wanted to know if anyone else is experiencing this. Any feedback would help.