I tried to put a Netgear MA521 wireless netwok card in my 1200 without success.
Then I got a MA401, which I know the amiga can use.
When I compared them, the 521 had a large ridge on the inserted end, compared to a narrower lump on the 401. I presume this is to stop you fitting a 3.3 volt card in a 5 volt pcmcia slot?