Poor wireless range

Broadband finally arrived in our village and i signed up with Plusnet and
bought their wireless kit.
This is a BT Voyager 2100.
The range is so poor ,i have resorted to wiring the 2 pcs directly via cable
to the router and all works fine.
However, the laptop i use has to be within line of sight and no more than 10
foot away to work.
Does anyone know if i was to disable the wireless function of the router and
use it purely as a modem, can i purchase a mimo or pre-n router and piggy
back this into the BT box to hopefully give me a better range?




John Biggin