On Sun, 5 Apr 2009 07:53:19 -0700 (PDT), ls02
wrote:

I am setting up home network with four PCs. One is in the office and
is connected to an 802.11n wireless router via a network cable. Two
others have 802.11n wireless cards. Unfortunately one PC is in
opposite side of the house floor above from the router and the signal
is very weak. I am not sure it is due to the card or it is just
because there so many walls between the card and the router the signal
is very weak and transfer rate is very low.

What's the possible solution to this problem? I am thinking about
running a network cable from the router to the room where the PC is.

I think you'd do better at alt.internet.wireless - but FWIW my cure
for a weak signal was a Linksys WRT54GL. On my second floor, and
works fine through 2 interior walls, an aluminum sided exterior wall-
and 50feet out to the deck. This is with the same computer that had
sporadic connections through one interior wall.

Check Newegg and Amazon for prices and reviews- I had to check Newegg-
still popular & $55.

Jim