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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 myth.

Why let the facts get in the way of your unexamined beliefs?

References a paper from 2009 (classified research could well have been much earlier):


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...

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.

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