I am assuming you are asking if the antenna was external of the airframe. No, it was not, it is totally encased within the airframe dead center of all that aluminum. I have enclosed a pic of my small Pitts, from the rear of the cockpit forward is aluminum sheeted and the Rx is center of the cabanes. I am currently building a $8500 Pitts and it will be the same. I personally have no doubt the signal has no issue with aluminum. Carbon fiber is a different story!!!