G'day Twin,
No you won't be able to use a wireless card. It requires the Operating System to know about wireless communication, and that was a bit before the time of the miggy..
A 10Mbit 16bit PCMCIA network card should work fine, as long as it doesn't have anything fancy on it. Like a combo network/modem or if its certain types of 3Com. There are combatibility charts out there on the web.
That one on ebay won't work. It's a CARDBUS type card. I'm pretty sure the seller has mis interpreted it as a 16bit card.
I have bought quite a few PCMCIA cards for my Amigas here, and I found as long as I stick to 10Mbit, and standard PCMCIA from a generic brand all was good.
I'll see if I can dig around ebay for some more suitable ones for ya..
Regards...