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Your live feed of the St Catharines Fire Department on the Niagare Peninsula in Canada has a constant hum on it. It sounds like an AC hum,and it is present even when there is no transmission, so it is not produced by a CTCSS. You call Niagara a county, but it is a regional municipality. And the fire department in question belongs to the city of St Catharines, which lies in that regional municipality.