I have a Ralink card as well with that chipset (WUSB600N), but I don't use it
anymore. It will not work with Trisquel and the Ubuntu support is spotty.
It is spotty because the rt2800usb firmware and driver in Ubuntu has
performance issues in speed and frequent disconnects. If it has to be used,
the rt2800 driver needs to be blacklisted and the rt2870 driver has to be
compiled from source with each new kernel upgrade. No fun.
ThinkPenguin offers G adapters and hopefully the Atheros N adapter will be
ready soon for Trisquel.