Aggravation cancels out stealth; stealth does not cancel aggravation. Having aggravation on basically means that you are as unstealthy as possible; every monster will wake up on the first turn it gets once you get within some large radius of it (28 or 30 tiles, I think).
I think that radius is your LoS -radius regardless of monster own detection range. With extremely low stealth you still don't wake up monsters that are further away than their detection range.
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