It’s stealthy in relation to radar, not visuals.
Radar is just a big signal emitter, that sends out energy, which bounces off something, then the radar receives the energy back. The change in energy lets the radar and its operators try to interpret the change and determine what the radar energy bounced off.
If you have a tennis ball, and you’re blindfolded, and throw it at a flat brick wall, it’s pretty easy to figure out what the ball hit. If you throw it at a slanted wall, only some of the energy comes back, as the ball comes back at an angle. Since you’re blindfolded, you might not even catch the ball. If you throw it at a very slanted wall, the ball might not even come back, so you wouldn’t know anything about what the ball hit – you might assume there’s nothing there to hit, since the ball didn’t come back.
But there is something there, it’s just stealthy.
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