extending your internet connectivity
You have two options:
- run an ethernet cable (say for upto 100metres - if a wire is appropriate)
- us a point-to-point bridge. Beam the signal across without loss of performance and no wires, up to 5 miles if you have line of sight.
Here is an example of a company providing this sort of hardware: (we can recommend this one as we have personal experience at BRM and know that the nanostation works really well)
http://www.ubnt.com/airmax/nanostationm/