Vanguard Radio Network (VRN) is a Philippine radio network. Its corporate office is located at Rm. 614, Cityland Shaw Tower, St. Francis St. cor. Shaw Blvd., Ortigas Center, Mandaluyong, and its main headquarters is located at Pan-Philippine Highway, Brgy. Sangitan East, Cabanatuan. VRN operates a number of stations across regional places in Luzon under the Big Sound FM and Big Radio brands.