A system and method for detecting and geo-locating signal ingress interferences in a cable distribution network comprising a head station for transmitting content to subscribers at frequencies within a network bandwidth. The system comprises a vehicle mounted geo-locating device for generating geo-location data indicating the geographical position of a vehicle, and a vehicle mounted transmitter for transmitting a radio-frequency signal comprising said geo-location data at a frequency within the network bandwidth as the vehicle travels within the geographical area of the network. If an ingress exists in the network, the ingress signal sent from onboard the vehicle would leak into the network to be received and detected by a receiver at the head station of the cable distribution network. A server is used to process the data extracted by the receiver to produces reports and maps reflecting ingress points in a geographical area.