Where are you getting that figure from? A long time ago, I heard that the standard setback distance for wind turbines was 1.5 times the total height. So, your typical 450-foot tower, including the blades, would be a little less than 15 acres.
Edit: Where I live now, I can see turbines from my front lawn, and the concentration of windmills is far higher than 1 per 80 acres. Here's a screengrab of some of the turbines viewable from my location.
The density of turbines (and clearings for pumpjacks and other oil shit) is pretty evident below. Not only that, there are semi-rural ranchettes (not included to avoid disclosing road/street names) scattered all over just the west of this screenshot with more wind turbines.
Amidst all this, you'll also find a shitload of cows grazing these acres, power lines, and new home construction.
https://energy.usgs.gov/uswtdb/viewer/#6.23/33.264/-99.808