I have 4 computers networked together with a Linksys BEFSR81 Cable/DSL Router. I would like to add a wifi network for more devices. How and what? My internet enters from isp cable modem in small business office in garage. Then to Linksys in the house, where all 4 PCs (including office PC in garage) are hooked up. I have another PC in another room that needs hooked up but have no more ports on router. Also I would like to add in wifi in entire house (including garage) for future equipment. I have tried a wireless router with wireless PC cards but could not get a strong enough signal to do any good. So I ran cat5e.