TV Scout API returns a JSON object with the following properties for each nearby transmitter, given a set of location coordinates.
Transmitter Properties
jsonfacility_id channel lat lon callsign ant_horiz_haat ant_haat ant_horiz_height ant_horiz_amsl ant_asml ant_type ant_horiz_ERP_kW ant_ERP_kW service_code service_type fieldStrengthPointToPoint distanceInKm distanceInMiles distanceInMeters shouldBeReceived bearing