Antennas can get significantly larger than what we're used to seeing, e.g., the thin pieces of metal extending out from car hoods. Heavy-duty antennas, such as those used for aircraft and spacecraft, satellite communications, and military purposes can get quite large and heavy, thanks to the number of complex radio frequency (RF) components that are required to give them their power. The Ka-band 4x4 Monopulse Array, a high-bandwidth, directional tracking antenna array for aircraft, is a complicated piece of equipment composed of 100 parts. Or it was - by redesigning and 3D printing it, antenna manufacturer Optisys was able to reduce it to a single piece that fits in the palm of a hand. Read more at 3DPrint.com: http://3dprint.com/178724/3d-printed...one-component/