Increase reception range

What you can do is make a wide U-shaped sheet of baking foil and point the open end of the U in the direction you need a better signal.

Your Wifi router is unidirectional...this means that it radiates energy in all directions.  The tinfoil acts very much like a reflector in a torch and points the energy in the direction you want it to go.

You'll definitely get a stronger signal.  The transmitter in your computer may not be powerful enough to reach back to the router, in which case, repeat the tinfoil at the computer end.

It's scruffy, but it works.  You can always use coathangers as a frame and make it look arty if you need it permanently.