AM Radio Trim
 

I don't generally listen to the radio as it only has AM, but now that it's baseball season, I fired it up. The reception was pretty bad but I remembered seeing in the assembly manual, that there is an adjustment to trim the receiver while still mounted in the truck. (See below.) Made a huge difference.
http://chuckbro.smugmug.com/Cars/196...dioTrim-X2.jpg