Hack-Hook
INT'L MOD
The altitude is not important . High altitude is a lot easier . We'll unless you fly above 30km .The Drone Iran shot down was a predecessor of MQ-4C triton and was literally flying at less than 35K ft altitude
A non-stealthy large drone flying at such an altitude was genuinely calling for trouble.
The drone rcs as explained in the article may not be as low as b2 but is well below an fighter like super hornet or raffael certainly several time less than f15.
And as I said guidance was done with ir and optic not radar




