why won't my wi-fi upload

I was having issues with my router dropping the signal and files not syncing over the net. i used speedtest.net. Using my regular wi-fi connection i got a ping and download speed but it would not upload. I put in an ethernet cable and upload was fine. I tried speedtest on a friend's wi-fi and still could not get an upload. It seems my airport won't upload through wi-fi.

Using Mac OS 10.6.8