And much of this depends on how much money you want to spend and how "clean" you want it to look. Most wireless routers now have four or five port ethernet ports as well. We use such a router. We hook the modem up to the router using whatever cable is necessary (In your case, run a cable from the basement modem to the main floor router), then run multiple ethernet cables from to router ports to the rest of the house, possibly to each bedroom.. The wires can be "dropped" from the attic/ceiling/crawlspace down to a RJ-45 jack box in the wall and connected there. When a computer is placed in the room, all the user needs to do is plug an ethernet cable from the computer to the wall.
By the way, if you want to simply get better wireless reception for the upstairs computer, you do have an option of purchasing a high gain omni-directional antenna(or making one yourself) and connecting it to the upstairs computer, then point it at the router downstairs..
Hope this helps.
We moved into a new house recently, and when we got our internet hookup with Roadrunner DSL, I asked if every ethernet port in the house would give access to the internet. The technician hooking up the modem said something along the lines of: No, you need a hardwire router to do that.
So right now, we have a slightly twitchy wireless, which I personally have no problem with. But, I'd still like to enable all of the ethernet ports to handle a computer plugged in, while maintaining my wireless.
Here's the scenario.
-Wires down in the basement storage, with modem hooked in there.
-Main floor computer with Wireless router.
-one computer upstairs, close to ethernet port; no internet access from the port. Very slow internet through wireless.
So, any ideas?