I would do this with a buried fiber run, if possible. +1 on the buried HDPE conduit suggestion; I don't like direct-bury especially for COMs. Avoid long runs of CAT6 cable; you'll need lightning arrestors on each end and you carry a risk of ground loops causing damage to your switches if the cable is shielded. You're also right at the limit of copper Ethernet allowable length; marginal lengths may have issues over time as the conduit fills with water (and it will no matter what you do). Fiber solves all of these problems, and is likely cheaper than copper these days. Pull in spare fibers - you'll need them at some point.
If you have to go wireless, Ubiquity is a solid choice. Their equipment is commissioned and administered via an application called Unifi Controller. You can purchase dedicated hardware (CloudKey2) to run Controller, or you can run it from any PC. You'll need access point(s) at the remote end for WiFi things to connect to, and likely a switch to provide PoE. If you stick with Ubiquity equipment in the whole network, you'll be able admin everything from "one pane of glass."
Their AirFiber line is a solid choice. Note that Ubiquity gear is not for the networking novice; you'll tear your hair out if you've never set up their equipment, and they have NO live tech support available (only online resources and forum posts). For reference, I have two Ubiquity U6-LR access points, a USG router, and a 24-port PoE switch installed in my house, and it's a solid network.
SceneryDriver