The Chinese military used a similar method to find US spy planes - they used background signals from e.g. cell phone towers and looked for the area where there was a "blank spot" - which was the spy plane's absorption of the spectrum.
This is a popular hypothesis, but how exactly do you think it may work? It's not like you can see a "blank spot" by looking from radio sources, you'd need to put your antennas in a position where the plain will intersect your line of sight to the transmitter. And not just one, but massive number of lines if you plan to track it and deliver a missile there. It sounds pretty improbable and I believe it's just an urban…
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...