I'm a physicist/RF engineer (I build things for MRI scanners) ... You definitely want to star ground your guitar. Any loop will act as a small antennae that will pick up the 50/60Hz electromagnetic field from the electric wiring in your house/studio/stage etc. 50Hz has a wavelength of around 6000km, and so you're definitely within the near field regime unless you are in the middle of the Pacific Ocean. Any loop of wire will couple strongly to this field (it's mostly magnetic), this includes a loop in your wiring in your guitar, this causes a common mode signal down what should be a differential (ie single ended) mode and that's why you hear a ground loop. I always star ground my guitars, it makes a hell of a difference.
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