Guess what emits UHF/VHF? Terrestrial TV stations and 900Mhz and 700Mhz cell phone towers , like Sprint and Nextel used to operate in the USA before their spectrum was traded/sold back to the government.
It's well known that low frequency radars can detect stealth airplanes. But it's difficult to target a missile using them, and they're too big to put anywhere but on the ground.
References a paper from 2009 (classified research could well have been much earlier):
https://medium.com/war-is-boring/the-u-s-navys-next-hawkeye-...
Guess what emits UHF/VHF? Terrestrial TV stations and 900Mhz and 700Mhz cell phone towers , like Sprint and Nextel used to operate in the USA before their spectrum was traded/sold back to the government.
China claims can track F22 fighter even in stealth configuration: https://news.yahoo.com/stealth-no-more-china-claims-02470090...
And this is what is publicly released for public consumption...