I've been reading up on those, Cor. Apparently they are legendary and hold up for many many years, scores of years or until a very bad storm comes through. One account of a ham in Missouri was able to find his after a bad tornado went through his neighborhood. He spotted it on top of a debris pile that was accumulated together for the county to collect. It looked a mess but after laying it out and inspecting it he took out the kinks and he was able to use it again!