You can get an 802.11 wireless based setup and use Yagi or parabolic antennas with range boosters to shoot the signal in that direction. much better effective range. you can shoot a singal pretty far with those.
if not you can get soem fiber optic cables (expensive but shoudlt be I mean they are plastic!!)
installing regular cat5e cables that way would invole way too many repaeters and you can only use so many of those and they are required every 100 meters. and using alot of repeaters will degrade signal too.
the best way is useing wi-fi with range extension or fiber optic. of course you can go microwave but its very expensive.
people actually took the whole prigles can idea and went commercial!