Networking over 3k of Open Land

Hi there awesome networking people,

I have to connect up a building that is 3,000 ft away over open land. This building will house about 30 people, with need for VOIP and Office Internet. Running fiber seems like the best way of doing it but I'll have to 2" conduit all that way.

Would antennas work? Which ones would you use? What's the risks?

Thanks so much. You guys rock!