I have a wired home network using a Linksys BEFSR41 router to network my cable modem to three PCs. One on the first floor (where the cable modem is located) and two in the basement. From one of the outputs in the basement, I want to add a wireless extension that will allow wireless broadband distribution to two PCs and a video projector. One PC is a laptop that already has wireless capability. The other is a home theater PC that currently has no network card. The projector has an RJ-45 Ethernet input.
What system hardware do I need to add? Do I need a router or access point to distribute the wireless signal in the basement? I know I will then need a PCI wireless adapter for the HTPC. Do I need a wireless bridge to interface with the projector?
Also, any particular recommended hardware? Brands and/or models would be appreciated.