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Do you not understand how radars work?
L band is low frequency and therefore low resolution. The supposed reason you've listed that it "works" against stealth is because most stealth planes are designed to be obscured from the higher frequency X band radar systems. But your repeated insistence that L band is somehow a stealth killer is stupid.
L band radar may be able to detect it but it can't give height, and it's ability to determine direction is exceptionally limited. This has nothing to do with "post WWII upgrades" because that's the very nature of low frequency bands. More importantly L band can't target or lock on, which makes it useless for actually destroying the aircraft. You need a higher frequency radar to do that, and guess what frequencies modern stealth aircrafts are designed to beat?
It's ability to detect height is correct, however direction yes they can detect very well, this is not ww2, many nations use them for early detection systems and even in airports for aviation.
Btw s band also bypasses most stealth which was used commonly in 1950's sam systems, they simply used a single frequency of s band for distance and another radar in s band for height. Given that those systems were in the 1950's and ran on the most archaic analog computers of the day, it would be foolish to assume it has not improved since then.
But on L band it simply can not be reflected except for delta wing designs, and even then they are only partly deflected returning a weaker signal so essentially decreasing detection range. But this is not going into the numerous other bands of radars used, or the use of ir tech, or even areal distortion which the soviets discovered with the sr-71 and no one knows how far they have taken that research since the 1960's except top levels of russian intel and military.