Just looking at the sky with a Mark 1 eyeball isn’t a great method of finding aircraft. Listening for them is marginally better, but it is pretty effective to shoot out radio waves and listen for them to bounce back. This RAdio Detection And Ranging or “RADAR” is commonly used to detect aircraft, and if you want to be stealthy you will need some way to avoid it.
The B-2 does this by trying to make sure there aren’t any surfaces that would bounce the radio waves back to the receiver. Angular surfaces to bounce signals off to the side work to do this.
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