Hi Maciek,

I have the same issue and I have detailed the problem here:

http://www.backtrack-linux.org/forums/hardware-compatibility-list/28102-belkin-basic-wireless-n-rtl8188su-not-working.html...

Update on this, seems the Realtek drivers don't support monitoring mode hence it wont work. Have to wait until someone releases some other drivers which will allow us to do this.

I also have a Realtek RTL8188SU USB Wireless card. I downloaded the Linux drivers from http://ud-pc.com/driver/Realtek/RTL8188SU/rtl8188SU_usb_linux_v2.6.0006.20100226.zip and did the usual:

make...