I first installed the Navworx UAT. Adhering to their instructions I obeyed the distance requirements by mounting the antenna in the tail. When my Navworx unit turned into a pumpkin I accepted the Dallas Avionics offer of a plug and play EchoUAT. That worked!! I recently received an excellent ADS-B performance report. My UAT antenna is still in the tail. I'm not sure it's necessary but that's where it is and it's working.