Does anyone know what freqs Bluebird AG Winamac, uses ? I searched the fcc uls and came up blank. Don’t know the call sign. They operate Air Tractor and Thrush aircraft and also drones.
Just a thought... The licenses might be listed under an employee's name, not the company itself (you might have already checked this).
It's also possible they are using air band radios to communicate when flying. You might want to check FRS or MURS if you're in the area of their operation (just to rule those out).