http://en.wikipedia.org/wiki/Wright-Patterson_Air_Force_Base


"(...)
Acting like the electrolyte in a car battery, barium chemtrails developed at Ohio's Wright Patterson Air Force Base are routinely sprayed into the atmosphere to 'duct' or bend military radio and radar waves over-the-horizon, instead of continuing straight beyond the Earth's curvature into space.
(...)"
http://www.holmestead.ca/chemtrails/soilradar.html