2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83543Mugnai et al. have reported an experiment in which microwave packets appear to travel in air with a speed substantially greater than c. They calculate the group velocity of their packets and find that it agrees with their experimental result. That calculation is incorrect. A correct calculation gives a group velocity less than c. The reported experimental result cannot be reconciled with the Maxwell equations.2 pages, latex. Revised to add a remark on the experiment and to correct typos in several equationsOpticstext