This is a round about way to get the wireless network drivers into the Fujitsu without removing the hard drive, and it worked very well for me.
You will need any type of USB thumb drive, and a PCMCIA modem.
I put the PCMCIA modem in my fujitsu, and win98 recognised and installed a default driver and the modem, and it worked fine. Next, set up a dial up account, and use that to log onto the internet. If you have DSL, call your provider and they can give you the dial up settings that allow you to connect if DSL is down. Most DSL providers offer this free of charge for up to 1-2 hours of connect time. Now, Download the drivers for the thumb drive and then install them.
Now you are all set! Now all you have to do is copy the Wireless Network adapter drivers from your PC to the thumb drive, and then plug it into the Fujitsu, and install the drivers.
Once that is done, you are on the network, and can copy any other files or whatever you need over the network.
Even easier, if you have a PCI to Compact flash reader, you can copy the files to the CF from your computer, and then just put that in the PCMCIA slot on the Fujitsu to install the WAN drivers..
As for the rubber antennae, mine had it as well when I got it off of Ebay. It is a RF card for a specialized network that will not work with 802.11b. It usually works with radio towers to give wide area network access. It is pretty costly, and the service is not available much anymore. I pulled the card out of mine completely, as it wasnt needed and just sucked up battery time.
As for only certain wireless card working, I had not heard that before. It is basically a Win98 machine, and with the proper drivers, just about any card SHOULD work. I used a Dlink PCMCIA WIFI card in mine with no problem, as well as a Dlink USB WIFI thumb drive.