scorz wroteWhat about using a coaxial cable to to the job?
If I am not mistaken the max length is 500m (10Base5) and you can use a connector coax/ethernet.
in his case 10BASE5 or even 10BASE2 ( with a bit of ethernet cable ) can work but tough luck finding the converter .
EoC has reached 100BASE-TX but i find it expensive for a home installation .. use wireless .. cheap and easy to setup