Sling is a paid service, i would think inoder to "integrate" that OTA tuner DVR thing ,into it, you have to pay for the service in the first place. I recall Sling having such a OTA device like this "new" AirTV before, back when i first looked at and tired them, years ago. Where u buy, hook up antenna, and connect the device to you account, and prestro, you now see antenna channels in your Sling app. This just new model of that it seems.
But there are better ways. If OTA is only your need, then use the HDHR software, or the native "Channels" Android tv app that has built in DVR ability and full guide.
This also is clearly and overly expensive branded device meant to draw one into the Sling ecosystem.
I can buy at Best Buy or Microcenter for under $99, a whatever brand OTA tuner DVR box with 1TB and expandable storage and use that to make records i can move to my computer with no strings attached. Sure, it don't integrate or run a Sling app...but it does works fine for those who dont care or have ability to use sling(u have to have internet to use Sling)
Sling, is the worst as far as channel offerings, the worst when it comes to TVE offerings....imo. I hardly see them as any sort of real competition. they are over hyped and last i read, their cloud dvr still had many issues and was not reliable.