How to measure crosstalk

Are you talking about aligning the heads on tape recorder? A phono cartridge? An antenna?

That's a pretty vague request you've put out.

> The word 'azimuth' is kind of a giveaway that you're asking about a phono cartridge. :-)

Perhaps your experience is limited to phono cartridges, but tapes heads in particular have an azimuth adjustment. And antennas also have that adjustment, though perhaps not as common a concern in the audio world.

I guess it is only a "giveaway" if you haven't dealt with the others.