Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. THe XAF Radar was an experiment radar constructed in 1938, survived World War II as a historical artifact, and is now placed on exhibit at the Historical Electronics Museum, located in Linthicum, Maryland. THe XAF an experimental radar that resulted from several years'' technical progress by the Naval Research Laboratory (NRL) was constructed in 1938, following a late February decision to install a radar set on a major warship. OPerating at 200 megacycles (1.5 meter wavelength) at a power of 15 kilowatts, the XAF featured a "bedspring"-like antenna about 17 feet square. THis was mounted in a rotating yoke that allowed it to scan around the horizon, and to elevate for what was hoped would be improved aircraft detection.