How fast can radio messages be transmitted?

In 1991, experiments were reported by Ishii and Giakos which led the authors of those papers to the conclusion that radio messages can be transmitted faster than light. Such an idea is an apparent contradiction to the theory of relativity, and has provoked rebuttals, e.g. from Tichy-Racs (1992) and Marks (1992). The experimental evidence which followed, showed that an RF-pulse signal cannot travel faster than light. A paper by Stephan (see IEEE Antennas and Propagation Magazine, vol.35, no.3, p.13, 1993) has revealed that the controversy has not yet been resolved. This article should clarify how a misinterpretation of the observation could be understood as transmission faster than light.<
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