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My embedded/internal wireless network card doesn't pick up enough signal for reliable networking/internet usage. However, if I move closer to the source (the window) it works fine. A wifi booster antenna is an expensive solution to my problem, just as an external network adapter with about 1m in cable lenght would be. All solutions however interface with the computer through a usb adapter, is there no solution that interfaces with my ethernet port instead?

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Before you go into changing hardware, try using inSSIDer to make sure your wireless router is not using a congested channel. If it is and you move to a clearer channel, your reception may improve. metageek.net/products/inssider –  paradroid Sep 24 '11 at 23:23
    
A Wired Ethernet port goes to a Wired Ethernet interface and circuitry. It's not as universal as USB, at least not in practice. I suppose maybe in theory you could.. maybe in theory since there are Network Printers I guess maybe they transmit their data over Wired Ethernet. They still need to get power from somewhere. The mains or the power wires from USB. What's your gripe with a USB wireless ethernet adaptor? You could plug in a new wireless card if it's a desktop. –  barlop Sep 24 '11 at 23:48
    
You can always get a USB cable to 'extend' your Wifi dongle to the window (or out it). IS there a reason you don't want to use USB? Or are you trying to do this for free without any hardware purchase? –  Jakub Sep 25 '11 at 3:11

2 Answers 2

What you're describing would be a Wi-Fi or wireless bridge. The dumbed down ones are called gaming adapters. At about $50 on average, I don't think they're a whole lot cheaper than the booster you mentioned.

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You could use a DD-WRT compatible router in client mode - not the cheapest option, but you can use it with multiple devices

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