somethingsane

I've been asked to figure out how to install a small 4 camera system for a home. Just a simple PoE system. But, one of the cameras is for a gate located around 600 feet from the house. Has anyone had any experience with directed wifi antennae, or line-of-sight systems with cameras? I will have electricity at the gate, but I'd rather not try to bury 600' of Cat5. Would Cat5 even carry signal that far? Any input would be greatly appreciated. Thank you