First of all, stay away from the cheap Chinese antennas, they will throw an error and do not work well. Stay with the PIFA antenna as supplied OEM, which will far outperform the other stick style antennas. You will only need 1 antenna unless you plan on using the TCU hotspot (with built-in antenna). You probably already have an antenna in the vehicle…
Ford PIFA Antenna HL3T-19K351-AA.
Don’t forget the cable. You need about a 1 or 3 meter FAKRA cable (RF).
Amazon.com: Bingfu Fakra Z Female to Female Vehicle Antenna Extension Cable 3m 10 feet for Car Stereo Android Head Unit GPS Navigation FM AM Radio Sirius XM Satellite Radio 4G LTE TEL Telematics Bluetooth Module : Electronics
And the power/data connector, unless the unit comes with it…
Ford WPT-242 Power/Data Connector/Pigtail C4803A for TCU
TCU part number needs to be a HJ5T-14G087-UF thru UM for your vehicle.
This is the authorization procedure…
Sync Connect APIM & TCU Programming and Activating.pdf (520.8 KB)
This is good to skim thru…
TCU HJ5T Asbuilt Discussion - Ford / AsBuilt - CyanLabs Official Community