Media for Cable return path has outside signals at 22mhz

Cable return path has outside signals at 22mhz

Hi all In our return plant that we are starting to implement, we are seeing signals in and around 22mhz. Does anyone know of a way of isolating the ingress point they must be coming in at. Seems they are some form of radio navigation signal, as it sounds like a beacon when you use a communication analyzer to look at the signals.

Thanks