Extremely slow file copying over airport extreme network

Hi,
I have an Airport Extreme Base Station (10/100) network, also connected to the internet. When copying files from my MacBook Pro to a USB drive connected to the base station, OR when copying files to another computer (a windows machine) the throughput maxes out at about 700 KB/sec which is 10 times slower than when copying to the USB drive connected directly to my MacBook Pro. Although I have updated everything to the latest and greatest versions, I still have very slow file copy speeds. It's always been this way. I've read dozens of threads for potential fixes but none of them have helped. I am using Activity Monitor to measure the throughput and also timing the copy of a 10GB file. At these speeds, that file takes 4 hours. Useless.
My base station is within a few feet. I've tried different channels, 2.4GHz, 5GHz, getting rid of WPA, you name it. At first I thought it might be some issue with the USB drive connected to the base station, but copying to another computer on my network is the same. It is very frustrating.
Any insights would be greatly appreciated.

Thanks. I thought about buying the TC but I'm worried that if my network is operating slowly, which it appears to be, that I'm not going to get the throughput. I also noticed that my windows machine which is on the same network accesses the internet faster as well. I'm wondering if it is something with my MacBook.
BTW - I went to school in Pittsburgh. Great great town.

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Here's how to find IPs on various machines, including Windows® varients...
http://www.helpdesk.umd.edu/topics/communication/ethernet/office/winxp/2882/
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If changing the WAN setting doesn't help, I would suggest two things: 1) Reset the WAN setting to Automatic, and 2) Perform a complete power recycle of your networking equipment, as follows:
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Power-up the AirPort base station; wait at least 5-10 minutes. Note: The AirPort's status light may continue to flash amber after it has intialized. That is because, there may be some additional configuration items necessary, like setting up wireless security, before the overall setup is completed to get a green status.
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Continue with step 2 in the first set of steps.
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http://support.microsoft.com/kb/259716
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http://social.technet.microsoft.com/Forums/windowsserver/en-US/3f8a80fd-914b-4fe7-8c93-b06787b03662/windows-2008-r2-large-file-copy-uses-all-available-memory-and-then-tranfer-rate-decreases?forum=winservergen
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Linking in your post over on Server Fault in case it gets resolved over there first ;)
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@jaspnwarren
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I have a G4 iMac connected to the Internet via an Airport Extreme. I also have an eMac in another room which can access the internet over the same Airport Extreme.
I have created a video file on the eMac but I need to burn it to DVD which means I need to get it to the iMac.
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Try these suggestions (copied from another discussion) which cover two alternative ways for getting file sharing between two Macs to work:
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As an admin user, you can access the whole hard drive.
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For more causes of interference, which is becoming a massive problem due to the growth of wireless, see this Apple Support Document:
http://support.apple.com/kb/HT1365?viewlocale=en_US
Message was edited by: Bob Timmons

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The new Airport Extremes and Time Capsules suffers from terrible performance over the 5GHz band and it's a problem that not only affects me and you, but hundreds of thousands of other owners.
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Not the happiest answer, but at least you have a clue now.
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Extremely slow file copying over airport extreme network

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