Helicopter Sound at 40-50km/hr

[jick.cejoco]

ask ko lang mga sirs, my car has some sort of "helicopter" sound galing sa harap lalo na pag around 40-50km/hr ang takbo. same case din pag naka neutral at 40-50km/hr and takbo.no noise naman when turning left or right. pina wheel balance ko na and alignment pero same pa rin. brought it sa 2 talyer to have the wheel bearings checked, ok naman daw. tire related na kaya? any ideas? TIA

does the sound disappear beyond 50 kph?
did this noise start after an oil change or after hitting something on the road?
are there plastic protective coating on the windshield trim?
are the windshield wiper springs weak?
have you tried replicating the symptoms with the antenna retracted?
is the fuel filler lid loose on its mount?
are the air dams or spoilers loose?
where is the general area the sound is coming from?