content: Not exactly. Older stealth aircraft like the F117 still had a significant enough signature that actually set off most radar just never enough to get a missle lock from the ground or coordinate a interception with other fighter aircraft. If the same older generation aircraft flew the same flight path over the same pissed off radar operators they do stand a better chance of accurately predicting the planes location. Newer stealth in the F-22 and the stealthier F-35 don't set off radar like the previous generation did and even have better x and y band protection from garbage S-400 tracking systems. Part of it is also detection of radar while staying out of it's hotspots as long as possible. If your radar signature is that of a baseball that baseball can sometimes get picked up by coordinated radar as a baseball traveling at 500 mph is pretty suspicious. However that's just a worst case scenario and why we try to avoid radar even with newer aircraft. Weirder however old tech would show up faintly by 1 or more coordinated air def. New stuff doesn't show up at all. Even with the Canadian vessels that uses the X + Y band now because they're paranoid as fuck about Russian stealth. You can technically use Doppler radar but it only works from multiple positions on older aircraft flying the same path more than once. Detecting newer aircraft with Doppler and X + Y systems like the Canadians is purely theoretical at this point. They make us dodge radar hotspots now primarily for the "what if" factor.