antenna region change ?

[jdm bm 1]

First of all is hi everybody  and i hope this is posted in the right place , i'm loving my 2010 japanese imported e90 335i but cant seem to find the answer here in the uk so hopefully one of you nice guys might point me in the right direction, the radio was getting me down so i thought i would have a go at changing the radio region after watching youtube videos, i purchased ncs expert from good old ebay and after some time i got it to work and i've managed to change the radio region so it goes up to 108mz but the radio reception is poor on some stations, in the video it says i need to change the antenna region as well but i cant find it so does anybody know what module to find it in or how to change it ?? as i dont seem to have the c-tune module which is in the video, thanks and im looking forward to learning about my car 👍