I am considering setting up a wireless cable internet connection for my iBook at home. I really don't know anything about it other than I know I need to buy an airport card and I need an Airport station. The Airport is really expensive though and I am wondering if I can use a cheap pc-type version? Will that work? Can anyone recommend a brand or model? When using a wireless connection does this decrease your overall connection speed? How do you protect your connection from others who may want to tap into your signal?