How can I increase the range of my magic mouse via bluetooth...

I would like to be able use my bluetooth devices (keyboard and magic mouse) from my 2011 imac running mavericks from an upstairs location to a downtstairs location with a tv and an apple tv usig mirroring options... The set up works if they are all a little closer together... If i get the two locations set up the way I want them - the mouse and keyboard keep losing connections and the mouse is very jumpy... Is there an amplifier or something else I can do to strengthen the signal?

Thank you very much in advance for your help