As stated, cat5 is not even remotely in spec at that distance. Best bet would be another wap at the remote camp and a good directional antenna or two.
I'm not recommending this, but just as a proof of concept, WokFi or Woktennas can provide anywhere from 3-10km of service with 2 matched antennas.
WokFi - Wikipedia, the free encyclopedia
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Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten