The feeds are divided up into HF (trans-oceanic), US Class B, US Class C, US Class D/Centers, Canada and International feeds to allow you to pick the one(s) your interested in. Where do these feeds come from and what are they?A LiveATC.net “feed” is an audio stream provided by a volunteer, usually referred to as a “feeder”…. The audio distribution system consists of a network of streaming audio servers which effectively make the single stream sent by the “feeder” available to many listeners.They have a wide variety of ATC facilities available to listen to, Boston’s Class B is a popular choice with Clearance/Ground, Tower and Approach/Departure all available so you can follow many of the significant tranmissions of departing and arriving traffic.