A method of operating own mobile communication system equipment to locate a transmitter that is using a spectral resource, wherein the own mobile communication system equipment includes a serving base station that serves at least one user equipment, the method comprising: operating the serving base station to receive, from each one of two or more remote sensors, sensing information from which transmitter location information can be determined, wherein the transmitter location information is oriented in a coordinate system used by the serving base station and wherein the remote sensors include at least one user equipment; determining one or more geographical safety margins from the transmitter location information; and adjusting transmissions from the serving base station to limit transmitting signals into a geographical area bounded by the one or more geographical safety margins, the method characterized in: that for each of the at least one user equipment, the sensing information supplied by the at least one user equipment comprises: white space sensing information from which a direction of the transmitter relative to a position of the user equipment can be determined; and pilot signal sensing information indicative of a respective one or more directions of one or more base stations, wherein the pilot signal sensing information is oriented in a receiver lobe steering plane of the user equipment, wherein the one or more base stations may or may not include the serving base station, and that the method comprises operating the serving base station to transform the white space sensing information and the pilot signal sensing information received from the at least one user equipment into the transmitter location information oriented in a coordinate system used by the serving base station. operating the serving base station to receive, from each one of two or more remote sensors, sensing information from which transmitter location information can be determined, wherein the transmitter location information is oriented in a coordinate system used by the serving base station and wherein the remote sensors include at least one user equipment; determining one or more geographical safety margins from the transmitter location information; and adjusting transmissions from the serving base station to limit transmitting signals into a geographical area bounded by the one or more geographical safety margins, the method characterized in: that for each of the at least one user equipment, the sensing information supplied by the at least one user equipment comprises: white space sensing information from which a direction of the transmitter relative to a position of the user equipment can be determined; and pilot signal sensing information indicative of a respective one or more directions of one or more base stations, wherein the pilot signal sensing information is oriented in a receiver lobe steering plane of the user equipment, wherein the one or more base stations may or may not include the serving base station, and that the method comprises operating the serving base station to transform the white space sensing information and the pilot signal sensing information received from the at least one user equipment into the transmitter location information oriented in a coordinate system used by the serving base station. that for each of the at least one user equipment, the sensing information supplied by the at least one user equipment comprises: white space sensing information from which a direction of the transmitter relative to a position of the user equipment can be determined; and pilot signal sensing information indicative of a respective one or more directions of one or more base stations, wherein the pilot signal sensing information is oriented in a receiver lobe steering plane of the user equipment, wherein the one or more base stations may or may not include the serving base station, and white space sensing information from which a direction of the transmitter relative to a position of the user equipment can be determined; and pilot signal sensing information indicative of a respective one or more directions of one or more base stations, wherein the pilot signal sensing information is oriented in a receiver lobe steering plane of the user equipment, wherein the one or more base stations may or may not include the serving base station, and that the method comprises operating the serving base station to transform the white space sensing information and the pilot signal sensing information received from the at least one user equipment into the transmitter location information oriented in a coordinate system used by the serving base station.