A method of operating mobile communication system equipment to avoid interfering with another transmitter's (201, TV1, TV2, TV3) use of a spectral resource, wherein the mobile communication system equipment includes a main node (207, 301, 500) that serves a plurality of user equipments (209, 211, 213, 215), the method comprising: operating the main node (207, 301, 500) to receive, from each one of two or more remote sensors, sensing information that indicates whether a signal from said another transmitter has been detected, wherein each of the remote sensors is situated at a respective one of two or more sensor locations; characterized by: using the sensing information and information about the sensor locations to ascertain one or more exclusion boundaries (319, 321) needed to avoid the main node's transmissions from interfering with said another transmitter's (201, TV 1, TV2, TV3) use of the spectral resource; ascertaining beamforming parameters so as to enable the main node (207,301, 500) to transmit within one or more predefined geographical areas (303, 305, 307) except for any portion of a predefined area (315, 317) located on a far side of the one or more exclusion boundaries (319, 321), wherein the far side is that side of the one or more exclusion boundaries farthest from the main node; producing two or more adjusted signals as a function of the beamforming parameters and one or more signals to be transmitted; and transmitting the two or more adjusted signals from respective ones of two or more antennas (505-1,...,505-N). operating the main node (207, 301, 500) to receive, from each one of two or more remote sensors, sensing information that indicates whether a signal from said another transmitter has been detected, wherein each of the remote sensors is situated at a respective one of two or more sensor locations; characterized by: using the sensing information and information about the sensor locations to ascertain one or more exclusion boundaries (319, 321) needed to avoid the main node's transmissions from interfering with said another transmitter's (201, TV 1, TV2, TV3) use of the spectral resource; ascertaining beamforming parameters so as to enable the main node (207,301, 500) to transmit within one or more predefined geographical areas (303, 305, 307) except for any portion of a predefined area (315, 317) located on a far side of the one or more exclusion boundaries (319, 321), wherein the far side is that side of the one or more exclusion boundaries farthest from the main node; producing two or more adjusted signals as a function of the beamforming parameters and one or more signals to be transmitted; and transmitting the two or more adjusted signals from respective ones of two or more antennas (505-1,...,505-N). using the sensing information and information about the sensor locations to ascertain one or more exclusion boundaries (319, 321) needed to avoid the main node's transmissions from interfering with said another transmitter's (201, TV 1, TV2, TV3) use of the spectral resource; ascertaining beamforming parameters so as to enable the main node (207,301, 500) to transmit within one or more predefined geographical areas (303, 305, 307) except for any portion of a predefined area (315, 317) located on a far side of the one or more exclusion boundaries (319, 321), wherein the far side is that side of the one or more exclusion boundaries farthest from the main node; producing two or more adjusted signals as a function of the beamforming parameters and one or more signals to be transmitted; and transmitting the two or more adjusted signals from respective ones of two or more antennas (505-1,...,505-N).