Out of the box wi-fi has a theroretical maximum distance of 330m (approx 0.25 miles) in perfect conditions, with no walls in between and a clear line of site, and the lowest speed.
Longer distances can be acheived with good directional antennas, but these all require a line of sight. Knowing the distance is not enough, what you can acheive depends on many factors (any trees/buildings in the way?).
There have been cases of hobbyists acheiving an 11 mbps link over 5 miles using custom antennas made from pringles cans. These however had the benefit of being installed on mountaintops, and with no obstructions between the two nodes.
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