Some followup comments and questions:
Help me out of the DARKNESS. Help me grow the Light. Help Me Stand out Bright! Driver and Firmware for Windows and Linux and Mac OS. Driver and Firmware Download and Update for Windows and Linux and Mac OS. Custom Search Opendrivers- Network- Ralink Network- RT2571. Driver Category.
1. One reason why you might be interested in a USB wireless antenna even if you've got a modern Mac with builtin wireless is that the reception on the Airport cards (at least in a titanium PowerBook like mine) is notoriously weak. There are lots of times when I get little or no reception and my pals with Dell laptops are doing great. I also want a cheap USB wireless device so I can play with gizmos like the famous Chinese cookware antenna.
2. Thanks for the warning that two antennas in use simultaneously can damage each other. But there's no problem as long as you turn off your built-in antenna before plugging in the USB one, right? Presumably you could avoid the problem by putting the USB antenna at the end of a cable, correct? How long would be far enough? And doesn't this problem also apply if people on two different laptops are working in close quarters?
3. So the Ralink driver trick only works with the B1 version of the G122. What if you can locate an older A1 or A2 version? Will they still work on Mac OS X 10.4? There seem to be plenty of them on ebay, although a lot of the sellers don't say and probably don't know which version they've got. (The ones who do so are trying to cater to TiVo users, who also have dependencies on the G122 version.)
Ralink Driver Update
4. Finally, are there any *other* USB wireless antennas which can be scrounged up cheap for use on a Mac? Don't answer that -- I'll start another thread.
Ralink Macos Driver