Wireless connection or fiber connection between buildings?

I would recommend fiber, but to do it correctly / by a company who runs underground/direct burial fiber is going to be the most expensive option.

If you're over the 328ft distance limitation of Ethernet, there are other alternatives to fiber that *may* be cheaper/adequate...

- VDSL pair, basically your own DSL circuit between buildings, only requires 1 pair of POTS (phone quality) wire, and you get Ethernet out at each end

- Proprietary Ethernet extenders (usually over 1 copper pair) Search Opens a new window

- MoCA coax over Ethernet, such as...
http://www.amazon.com/Actiontec-Ethernet-Adapter-Service-ECB2500CK01/dp/B008EQ4BQG Opens a new window

- Proprietary coax extenders,such as...
http:/ Opens a new window/www.axis.com/products/cam_acc/media_converters/cam_t8640/range.htm
http:/ Opens a new window/www.veracityglobal.com/...