Ordinarily, in order to establish communications at locations such as disaster sites, rescuers have to transport and set up relatively bulky, costly satellite dishes. Soon, however, a simple tubular antenna made of woven strips of material may get the job done.Developed by scientists from Stanford University and the American University of Beirut, the prototype device is a form of what's known as a helical antenna. In general, this type of antenna consists of one or more conductive wires wound in...