Times have changed.
800 feet is a long run and may even need an additional amp to compensate for the loss that the Internet frequencies are on.
They are on a higher freq now and lose a lot of signal in long runs.
You cannot get and run the cable yourself. 800 feet would need to be a plant extension with hardline feeder cable.
Here is feeder cable.
»img.weiku.com/waterpicture/2011/ ··· 22_2.jpg
Never heard of the first 600 feet free.
If you have people around you get with them and see if you can pool your resources.