Existing comment:
Tree Stump Bug:
In the early 1970s, US intelligence placed a bug in a wooded area near Moscow to eavesdrop on radar and communications signals of a nearby Soviet missile system. The intercepted signals were stored and then transmitted to a satellite passing overhead, for retransmission to a ground site in the US.
The device was concealed in an artificial tree stump, camouflaged in a cluster of trees and tall grass. The top of the trees stump appeared to be opaque, but was actually transparent. It allowed enough sunlight through to charge the device's solar batteries. The KGB eventually discovered the bug. |