Arduino + seedstudio nfc V2 + multi-antenna

Hello Everyone, I recently bought an arduino uno and a NFC Shield V2 from seedStudio : http://www.seeedstudio.com/wiki/images/thumb/d/d5/NFCshield.jpg/400px-NFCshield.jpg http://www.seeedstudio.com/wiki/images/d/df/NFC_Shield_Schematic.pdf

Everything work fine.

Now I would like to detect my cards with differentes antennas on the shield. Trying to do something like that :

antenna 1 detect card 3 antenna 2 detect card 1 antenna 1 detect card 8 antenna 3 detect card 9 ...

In a first time, I use an NPN 2N 2222 to switch from one antenna to nothing : http://hpics.li/0cfc701

But it doesn't work. I try to inverse the NPN but nothing happen.

I would be very happy if someone could help me Maybe is there on other way to make this ? Thank you