IPad (and iPhone 4) upload speed on wi-fi very slow - any thoughts?

Both my "i devices" - an iPad and iPhone 4 are very slow for upload speeds on wi-fi. For example, here are the results of using speedtest.net on my iMac 21.5", iPhone 4 and iPad just now:
iMac: download 38.39 Mbps, upload 19.22 Mbps (so the wi-fi network itself has good upload speeds)
iPhone 4: download 21.17 Mbps, upload 0.39 Mbps (why so slow?!)
iPad: download 23.66 Mbps, upload 0.71 Mbps (why so slow?!)
The wireless router is an Airport Extreme updated to the latest firmware.
I've seen screenshots of other people's iPad and iPhone speedtest.net tests where the upload speed over wi-fi doesn't suffer compare to download like mine does, by a factor of 54!
I've seen postings here and there by people with similar problems. Are there any solutions? Are my iPad and iPhone 4 bad? Are they incompatible with my Airport Extreme? Are there "settings" somewhere that can help with the problem?
Any advice would be appreciated.
Thanks.
doug

Hi, Carolyn.
Perhaps so. Maybe there are certain kinds of connections which are better suited for iPads and iPhones than others. But the download speed on neither device seem to have problems. It's just the upload speed.
I did try several channels yesterday - 6 through 13 - but it didn't seem to make a difference.
Why would trashing my Mac preference files and restarting my Mac help anything? My Mac isn't having any problems.
Oh, by the by, on my iPhone at least I already tried resetting Network preferences. I even did a Reset > Erase All Content and Settings and re-installed my iPhone 4 from scratch. While still in a "vanilla state" before restoring from my backup, I tried testmyiphone.com via Safari and got similar results - very poor upload.
The 3G connection also fluctuates between "so so" (1-2 Mbps down, 0.8 Mbps up) and really horrible (0.2 Mbps down and 0.05 Mbps up).
I did just try your suggested "reset networks" on my iPad. This time I got a download of 13.26 Mbps and upload of 2.2 Mbps on the first test. On the 2nd test I got about the same download, but an upload speed of just 0.63 Mbps.
So something's still wrong.
doug

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