On the actual Columbia space shuttle there is on the tail what appears to be a antenna housing which is quite noticable when compared to the other space shuttles. I dont know how to insert a picture but here is the link to a picture of Columbia on landing and if you look on the tail you can see the antenna housing
http://www.ufoindia.org/images/columbia-large.jpg
Just might be an idea on a update or later addon. Either way I'm still happy as a pig-in-$&!#  :D just to have this fine addon.