Long distance networking

[n0dalus]

Hi everyone,

I have been doing some volunteer work for a small non-profit
organisation out in the country (among other things have been helping
them transition to open source software, and talk to them about
Linux), and there's a bit of a networking problem. It's not really
related to Linux, but I thought this would be a good place to ask
anyway (sorry if it's not).

There are two separate networks on the property, with one a few
hundred metres away from the other one at the bottom of a hill. We
would like to get the two networks connected, but cat5 only goes about
90m according to Wikipedia. We looked into wireless but it was pretty
expensive for the antenna and stuff - I thought a wired network might
be cheaper. One problem is that there is no power between the two
buildings, so we wouldn't be able to put any powered signal repeaters
or anything there without a lot of effort. They wouldn't need the full
100mbits, and anything is better than nothing really. I'm sure this
kind of thing must have been done before, so if anyone has any
experience that would be appreciated.

Thanks for your time,
n0dalus.