Trunk Antenna

Disconnect the negative (-) battery terminal.
Using a clip remover, detach the clips, and remove the rear transverse trim (A).

Fig 1: Rear Transverse Trim With Clips
Courtesy of KIA MOTORS AMERICA, INC.
Disconnect the connector, then remove the trunk antenna (A) with loosening 2 nuts.

Fig 2: Trunk Antenna With Nuts

Courtesy of KIA MOTORS AMERICA, INC.