whistling sound

:
2002 Mazda Protoge5
when i drive on the freeway (60-70mph) i hear a strange whistle coming from it seems like the rack on top of my car but im not sure. I definitely only hear it when im traveling at high speeds. any ideas??
 
when i drive on the freeway (60-70mph) i hear a strange whistle coming from it seems like the rack on top of my car but im not sure. I definitely only hear it when im traveling at high speeds. any ideas??
Its your rack... my p5 did the same thing due to the factory rack
 
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