or would Bluetooth be an option?
Bluetooth range, under ideal conditions, is 10 meters.
indeed Bluetooth Class 1 is 10 meter, Class 2 goes quite further (20-30 mtr) - http://www.ehow.com/about_5553812_bluetooth-class-vs-class.html -
In open field we have tested BT Class 2 up to 130 meter (line of sight) before connection got lost. We had to go back to ~80 meter before connection restored.
Note that the bandwidth drops (substantially) with the distance.