Poor Signal for wireless internet in home with Linksys rounter.

You might want to download a new software Bzeek | Empowering people to connect (invitation code x1234) that upgrades your laptop to also be a free router. Therefore you extend the WiFi connections.

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It just works!

 

I assume the antenna on the desktop is buried in the back, and that by 5 feet, you mean through walls and floors/ceilings. Make sure the antenna has a good connection and hasn't been damaged. Move the computer away from the wall and adjust to see if you get a better signal.

If you're using a little USB wi-fi adapter, then they usually have poor signal anyways with little to no antenna.

Have you tried changing the channel on the router? You may be getting some interference from a router on the same channel--maybe a neighbor who comes home every summer. It's also possible your air conditioner is emitting some electrical noise. The weather alone shouldn't be affecting your signal.