On Weds 5/15/19 around 2:20PM I heard OHAMA the federal helicopter for ICE calling Indianapolis tower on 120.900. OHAMA was not declaring a aircraft emergency. The were letting the tower know that the were going to set down at Eagle Creek Airport The had a open door on the helicopter. They also told the tower that they were going to 122.800 for Eagle Creek. Felt his post needed to be here. They were using VHF am aircraft frequencies 120.900 and 122.800. Always a good thing to monitor your local aircraft frequencies.!!!!!