Doesn't look like much, does it? But the next time you're lost at sea, you just might be thankful you've got it. That little square of fabric is actually a flexible antenna designed for the Cospas-Sarsat distress signal network, a Cold War-era system built to help pinpoint missing ships, planes and people. Designed to be sewn into a life vest, the antenna broadcasts an emergency beacon at a low frequency for greater range; in field tests, that helped rescuers find it within minutes. It's also tear- and water-resistant, which you'll be grateful for when
