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As Christopher said, it depends a lot on your environment. In a perfect world, line of sight without any obstructions, you could see 50% signal strength for 300-400 feet with a good residential AP. At the same time, with that same router, you could potentially get a very poor signal the next room over. The signal can be affected by interference from walls, wiring, plumbing, heating ductwork, microwaves, etc. so it is difficult to give a hard and fast number for expected range.