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Known stealth aircraft as they pass through the radio spectrum leave a detectable ‘hole’ and can be tracked.

This is not a fact that has led to a known countermeasure. The Chinese have claimed they can do so, but no aircraft is radar signature free.

Modern radar systems, of which I worked a few, are computer guided and driven. The radar signals are just radio waves, usually at a very high frequency, but some say a lower frequency radio wave would track a stealth aircraft better, but again, that has not been proved as meaningful enough to actually field such a system. In any case, the radar system computer generally ignores small temporary spectrums returns as they are likely birds, debris or bats.

To send a missile to such a location would cause one to run out of expensive missiles very quickly.

Our F-117 is actually very good at portraying such a radar return. Actually, better than the F-22 or F-35. Earlier this year, the USAF took some of these F-117s OUT of mothballs.

I wonder why?

Still, do understand that in a combat run, the radar operators would see blips. Stealth doesn't mean completely invisible, and never did. The ability to successfully track, lock on, and shoot down a stealth fighter is a quantum leap harder than non-stealth aircraft.

I wonder, even if the former/current communist powers have such systems, whether graft and corruption would also mean they're operating substandardly?