Is there a standard/exact location for the radio antenna on the AD trucks? I would like to drill and cap an antenna hole while in the primered stage even tho no radio will be installed until later. My truck did not have a PS mirror but the holes are easy to locate from the inside of the stripped cab. Just haven't been able to locate anything that looks like an antenna location. I remember reading somewhere that the location of the antenna was "critical" on these trucks but don't recall the context of the statement. Thanks for any help.