I have done the same, and it sort of works, but not very well. If you are more than a few feet from the router, it disconnects at random. I presume that you have the 3000uk model, or the Belkin driver should work.

I had the following comment from Belkin Technical Support:
"Clive, the driver for F5D7050 version 3000 is available. However, only F5D7050 Version 2000 is compatible with MAC OS 10.3 It is not compatible with the other version of MAC operating systems. F5D7050 Version 3000 is not recommended to be used in MAC operating system as it is not compatible with MAC. "

He then went on to suggest various things, including:
- However select any channel from 1 to 11 and leave it at the one that gives the best range.
- Change Wireless Mode to 54gLRS.
- Change Wireless Mode to Long Range Mixed.
- Change Wireless Mode to 54gLRS or Long Range Mixed.

Helped a bit, but not much. I hope Ralink will come up with a better driver in due course. In the meantime I'm going to use wire.