ASTRON, the Netherlands Institute for Radio Astronomy, is located just outside Dwingeloo, The Netherlands. Our mission is to make discoveries in radio astronomy happen. We are a world-wide leader on the development of array antennas for radio astronomy. We have developed and built phased arrays of 100,000+ elements operating between 10 and 250 MHz, and L-band phased array feeds for the Westerbork Synthesis Radio Telescope. Our research and development aims at continuously improving the performance and cost-effectiveness of this technology for future telescopes, such as the Square Kilometre Array.