Liftgate Intelligent Access (IA) Antenna
WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The liftgate IA antenna is hardwired to the RFA module and, when activated by the RFA module, it transmits a low frequency signal that activates an IA key.