Arnold Frederic Wilkins OBE and an assistant prepared the equipment, which was to listen-in for any extraneous radio waves (interference) on the BBC's wavelength of 49 metres as a plane flew overhead. In the early morning (Tuesday 26 February), the Handley Page Heyford (a biplane) K6902 took off from RAE Farnborough and climbed to 6,000 ft, being piloted by Flt Lt Robert Blucke (1897-1988). The Heyford was probably the largest aircraft the RAF had at the time. The radio signals to be tested came from the Marconi/BBC transmitter at Borough Hill two miles to the north-west.