radiating portion of the antenna or decrease the height of a lighted antenna structure or in the location of an antenna when such relocation involves a change in the geographic coordinates of latitude or longitude by as much as one second, or when such relocation involves a change in street address. Station. identification. 24. All licensees shall ensure that each class of station, unless exempted by the terms of a stations authorisation, transmits assigned call sign at the end of each complete transmission; Provided, that the transmission of the call sign at the end of each transmission shall not be required in cases of projects requiring continuous, frequent or extended use of the transmitting apparatus, if, during such periods and in connection with such use, the call sign is transmitted at least once every thirty minutes. Type approval and inspection. 25.(1) No frequency spectrum shall be assigned unless a radio equipment in respect of which an assignment is sought has been duly type approved by the Commission. (2) Upon installation of the radio communication system, the licensee shall ensure that the system is inspected and certified by the Commission to be operating in accordance with conditions of assignment. Monitoring and Inspection. 26. (1) The Commission shall monitor all emissions from licensed stations for the purpose of ensuring efficient utilisation and compliance with licensed parameters. (2) The licensee shall provide unlimited access to the Commission’s authorised officers to the licensees’ installations for purposes of inspection and verification of operational parameters. (3) All records of stations shall be made available for inspection by the Commission’s authorised officers at any time while the station is in operation. (4) Any interference experienced by the licensee shall be reported to the Commission in writing. (5) All frequency licensees shall comply with 26