The HAARP patent calls for spraying barium in the atmosphere to enhance the effects of HAARP.

[jose v]

When chemtrails contain compounds for conducting or amplifying electromagnetic energy, we're exposed to an increased risk of harm from the intense radiation emitted by cell phone and microwave transmitter towers, radar installations at military bases, high-voltage power lines, high-power military relay towers and the myriad other well-documented sources of "electronic smog" - 15 million times more intense than natural background levels.

http://bariumblues.com/haarp_patent.htm