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.