Hope you'll be your usual forgiving selves if I ask questions that go back to the very basics.
We're toying with the idea of setting up a wireless link for the iMac (traditional, running OS9.1). At present we have a USB modem (Speedtouch 330 - Alcatel according to Apple System Profiler, labelled as Thomson) bought at discount from our ISP when we went broadband. It's linked to the Mac via a trailing extension lead from the socket in the hallway. It all works fine, but is - well, messy and inconvenient (not to mention a safety hazard).
Am I right in thinking the set up would be: Phone socket -> modem -> wireless base? Then, presumably a wireless card is needed in the iMac - will a wireless base station come with its own dedicated card for the Mac, or do I need an Airport one?. Presumably unless the base station I buy has a USB socket, I'm looking at a new modem as well? And presumably we still need the ADSL filters? The house has solid brick internal walls downstairs - is that likely to pose a problem? The furthest the Mac would be from the base would be about 35 feet (approx 10 metres for you metric folk).
Sorry about the number of questions, but I find the more I read, the more reader-knowledge seems to be assumed by the writer! (As the song went "There are more questions than answers..."