I would avoid wireless on a classic amiga. the power required for the de-cryption etc makes it too slow., Wired much better results
I'm using an Ethernet Power line adaptor. This is a device that plugs into an electrical outlet and gives you a wired LAN access. I have this connected to a small hub that goes to an x86 box, an xbox 360, a Pegasos2, and an A1200!
About 50 bucks for the pair of powerline adaptors. Highly recommended