There are no routers that will run wireless at anywhere near 1000m. You will be lucky to even get 100m. The very best 802.11ac router maybe get a couple hundred meg download speeds.
That router uses the same radio chips as a dlink 850l so it should be similar. Unfortunately the only way to see things like antenna and power levels is to dig the fcc test reports they filed. I will leave that chore to you to see if it really is the same as the dlink
https://fcc.io/T58/WF2780R