Someone with more knowledge will fill in the blanks here. By stealth they mean low radar signature, thats usually how planes are spotted first. The stealth aspects that I’m aware of comes from two aspects, the shape and material of the skin.
Radar needs to physically travel from the radar site, hit the plane and come exactly back to the site. The plane is angled so radar bounces off and away so very little radar actually returns. The skin of the plane is also made from a material that will absorb(or maybe scatter)some radar instead of bouncing it back.
These features allow the plane to travel closer to radar sites than other planes. Maybe even pass between sites far enough apart.
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