Do as John said, go wireless.
http://www.broadbandbuyer.co.uk/Shop/ShopSearch.asp?CategoryID=79
7dbi or 14dbi antennae will get you there quite easily. 14dBm of gain will cover a 2.5hectare area quite easily.
Running copper between buildings means that you have to deal with ground potential. This means any time there is any form of electrical storm in your vicinity your equipment will "feel" it.
http://www.broadbandbuyer.co.uk/Shop/ShopSearch.asp?CategoryID=79
7dbi or 14dbi antennae will get you there quite easily. 14dBm of gain will cover a 2.5hectare area quite easily.
Running copper between buildings means that you have to deal with ground potential. This means any time there is any form of electrical storm in your vicinity your equipment will "feel" it.