[simonchs]

This is not a retrofitted NBT EVO ,this unit was original in the car .

if the car did not come with carplay prep 6CP or 6WD then antenna will not be there.

Here are the options on the car

Right, your car do not come with wifi antenna.
For F36, wifi antenna only come with if your car had 6CP/6NS/6NW.

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#8 WLAN cable aerial

Are you sure about 6NS? My car has 6NS and retrofitted apple car play.
Mine is not working like OP and I am waiting for wifi antenna.

Please ref. to the attached pics on post #8 in this thread.
I'm sure for OP's case as he provided VIN and I used his VIN to check.
And I won't sure your case as I don't have your VIN 
By the way, I've helped some F80 LCI to get CarPlay in my region, both of them are EVO unit with 6NS, and factory installed wifi antenna.