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I heard the signal dies, plus I don't know how I would run wires from oppisite ends of a large house

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The signal dies from Ethernet cabling? You do realize that cable wires are run hundreds of miles across the country without significant signal loss, right? We're talking 100 feet or so.

If you don't want to run cabling, then wireless is the only option you have. Which sucks. So either put up with a bit of trouble now and wire it (which is infinitely more reliable and faster) or stick with wireless connections that drop out during hands.

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Alright you sound like you know what you are talking about. I have a cable modem hooked up to my downstairs computer. To run it upstairs, do I just need to buy a very long cable cord? Do I need another modem? Thanks a lot