So you can tune a body to the emitting source, if it is understood - thus revealing stealth capabilities if you know the radar emission freq? How much is geome

So you can tune a body to the emitting source, if it is understood - thus revealing stealth capabilities if you know the radar emission freq? How much is geometry vs material science? We know that anachoic chambers have pyramid-ic structures of foam. So I propose the most stealthy paint would be tiny pyramids of aero-graphene in a spray with a carbon based paint, such that the pyrs absorb bot heat and sound and radio waves.