Open Signal maps is a very unreliable source for locating sites. However, we do have maps in the Sponsor section of our site that shows every Sprint site in the country.
In rural conditions, you may be able to get Sprint LTE out about 2-3 miles. But the performance may be iffy. If your 1x signal strength is worse than -95dBm, you'll likely not get a very good Sprint LTE signal it not at all once your area is built out.
But beyond all that, only smartphone data is unlimited. Tethering is limited to data caps, which I believe the largest cap is 12GB. That's not very much for home usage. Sprint is expected to crack down on unauthorized tethering on their LTE network.
Robert via CM9 Kindle Fire using Forum Runner