Abstract: An anechoic chamber utilizes an expanded central area resembling two flared horns with their rims fastened together, with the general vertex area of one of the horns forming the source area of the chamber and the other end the test or receiver end, there being adequate room beneath the two ends to include as part of the chamber rooms outside the chamber shell for housing the transmitter and receiver equipment. The purpose of the flare is to reduce shallow angle incidence on the walls of the chamber to improve performance by decreasing reflectivity.