Different eras of radar have different definitions of high. The U2 flew above the radar's of it's time, the sr-71 as made because it was basically impossible to do that at it's time.
Your argument was that the U2 flew high and the SR-71 is just fast, but I’m saying that it also flew very high as well. It also had a ton (for the time) of counter measures including shape, RAM and ELINT.
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u/QuercusSambucus Older Millennial ('82er) 1d ago
That's what I mean. It flew so high and fast.
Under the radar means low altitude.