1) Download the Realtek (now Mediatek) drivers for the RT8070 /RT3070 /RT3370 /RT5370 /RT5372 USB here: Mediatek
2) Extract the contents, and browse to that directory in konsole.
3) For a 32-bit system, assuming you're using a network manager, edit the file "os/linux/config.mk" and change these two lines to "y":
HAS_WPA_SUPPLICANT=y
HAS_NATIVE_WPA_SUPPLICANT=y
4) In a terminal, run "sudo make" and "sudo make install"
5) Now blacklist the conflicting drivers:
In PCLOS, edit "/etc/modprobe.d/blacklist" and add the following lines:
blacklist rt2800usb6) Reboot with N-band wireless.
blacklist rt2x00usb
blacklist rt2800lib
blacklist rt2x00lib
blacklist rt2870sta
Note that this device and the compiled driver do NOT work on 64-bit systems. At least not on 64-bit Arch Linux.
See this page at the Bridge Linux forum for everything I tried for 64-bit. A huge +1 to ludvick there for his assistance.
Reference page for compiling the driver: Arch forum.