(1985) In February, 1985, we carried out an eavesdropping experiment in London, in cooperation with the British Broadcasting Corporation. Part of the results were shown in the programme „Tomorrow‘s World.“ A small van was equipped with a 10 metre high pump mast to which a VHF band III antenna was clamped (10 dB gain). The received signal was fed through an antenna, amplified (18 dB) and displayed on a television screen inside the van.

For obvious reasons we cannot give information on the data picked up during the experiment. The results can be
summarized as follows:

• It is possible to eavesdrop on the video display units or terminals in buildings from a large distance, using a car fitted up for the purpose.

• Although the experiment was carried out in broad daylight and many people watched us, nobody asked what we were doing.