3com 3crwe777a reception bad!

hi...
i have 2 wireless network card at home..

1 is basically the 802.1b card which is build in to my notebook (centrono)..

another one is the 3com 3crwe777a pci wireless nic card...

my problem is.. i can use my notebook inbuild card to connect to my
neighbors AP.. but the 3com card keeps saying no network found...

i tried to put both card at the exact same location ... still my notebook is
the only one can get the connection BUT not my PC...

any idea on why is this hapenning ? or is there any way to resolve it ?

i would like to put my PC stay connected as i need to travel with my
notebook...