Comment by gandalfian

My real world wifi experience. Domestic 2.4ghz wifi ap with a directional antenna plugged in, 600m direct line of sight across valley to neighbours netgear ap with stock antenna, assumed in his window. Internet achieved. Wifi ap, stock antenna in my house window, looking unobstructed over field, I get wifi internet on my phone about 200m out. Indoors in my stone walled house wifi is perhaps 10-15m. So half a mile range or 600m is almost true in a marketing sense though a bit dishonest in a real world usage sense.