[rayiner]

At relatively short distances (hundreds of meters), enough radio waves bounce around in the environment to still make it to the receiever. https://spectrum.ieee.org/telecom/wireless/smart-antennas-co.... You need beam forming antennas to take advantage of this fact.

See: http://about.att.com/innovationblog/two_years_of_5g_tria

> Learned mmWave signals can penetrate materials such as significant foliage, glass and even walls better than initially anticipated.