WARNING: This page is about a different car, the 2020 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
The antenna coil (A) has the following functions.
The antenna coil supplies energy to the transponder.
The antenna coil receives signal from the transponder.
The antenna coil sends transponder signal to the IMMOBILIZER.
It is located directly in front of the steering handle lock.