If your signal is very low, then your router might have interference.
Is it on another floor or behind walls, heaters etc?
On my desktop, I had to buy a cable to extend my antenna away from the back of my pc as it's in a corner of the room.
I just unscrewed the antenna from the back of the PCI wifi card and added the screw in cable in-between. Doing that gives me a better signal than my girlfriend gets when she sits in the living room where the router is.
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