The Zeven DECCA-transmitter was a transmitting facility for DECCA transmission at Zeven, Germany. It used a 93 metre tall guyed mast antenna, which is insulated against ground. As backup antenna, a 46 meter mast radiator also insulated against ground was in its proximity. After shut-down of DECCA, the facility was not used until the 2004. At this year it started transmitting of DGPS-signals on the frequency 303.5 kHz.