This is simply the feed from an RCAG repeater, Indianhead, PA (IND) to be exact from Cleveland Air Traffic Control on 132.125 MHz AM.  Very good feed that captures both ATC and Pilots.  This feed also serves ATCLive and Radarbox as well.  Currently, it is comprised of a Raspberry PI 3B+ and a Radarbox SDR that is filtered specifically for the VHF Aircraft Band.