📚 180 crossed-dipole antennas let H.A.A.R.P. test how radio waves interact with the ionosphere, not control lower-atmosphere weather.
H.A.A.R.P. is a University of Alaska Fairbanks-operated ionospheric research facility near Gakona, Alaska. Its 180-antenna transmitter briefly excites small regions of the upper atmosphere so researchers can measure radio-wave and plasma processes; this physical scope differs from weather-control and earthquake claims.