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Actually a bit of a common misconception here. 'N' doesn't really have longer range than 'G' in practice and often will have less. Range is really dictated by transmit power and receive sensitivity and in neither of these terms is 'N' any different from 'G'. It'll often achieve higher speeds at the same range, but total range will not be increased. Due to the relative immaturity of 'N' still (most gear is still "draft-N" and not final) it can be a little more unstable as well.