Wheel Hub Question

Hey guys, I had a question....
How do you know when your wheel hub is bad or going bad?
Is there any special sounds or signs I need to pay attention to?

02 GTP
75K miles

Possible ABS and Trac Off lights. Noise sounding like an airplane starting at around 30 mph and increasing in pitch as speed increases. May change pitch when moving steering left to right and vice versa. ABS braking kicking in when it shouldn't or failing ABS initialization.

Ok, I dont know if its the wheel hub, but I do hear a winding noise coming from the front of the car. dont know if its from left or right.
But as far as an airplane, I dont think its that load. uhm!!!!

does the noise stop completely when the cars not moving? does the sound change with speed?

Yes, noise stops completly when car is not moving, and then It starts up again when car goes .
Sound doesnt change with speed, it stays the same , and you can hear it more with the windows closed.

Jack up the car on the side that is making noise and spin the wheel and see if you can hear or feel if it is the bearing?

Once you have both of the wheels off the ground, put your hands @ the 12 o"clock & 6 O'clock position of the tire & try to shake it to see if you can detect any loose movement. If you detect any movement, more than likely the hub bearing is bad!