so you've tried the wireless capable device both wireless and wired up trying to achieve the max speed?
Install
inSSIDer on your wireless capible device. open the program and let it search for all the networks within reach of you.. once all have appeared look at each networks channel number, they will range from 1-13... note channels numbers that are not used within the 1-13 range then set your hub to use the unused number.
also change rate mode that matches your wireless device, 54/145/300.