device to boost Wifi signal

[nightrider1470]

In my bedroom I have a switch box with that I attach all my hardware via ethernet. Is there anything I can buy to maybe plugs on to the switch box to boost my wifi signal or maybe something that goes in a plug socket?

 

[BigBoy]

Like a wireless range extender? Like this

Or Home Plugs Like this

Oh and wrong forum dude we have a dedicated Networking section over here.