Wireless Microphone System Vhf A guitar pickup is basically just like an energetic microphone coil. For many years, vibrant microphones have already been wired with the voice coil attached to the primary of the microphone's transformer, and not referenced to soil (‘floating'). The microphone's case is usually attached to the wire shield, that is linked to the mike amplifier's surface (see Rane's site for more discussion).
By and large, vibrant microphones are very quiet devices consequently of the mixture of transformer isolation and balanced, suspended transmission lines for the duration of, along with protected, humbucking coils.
So why don't you instruments? Instruments are notoriously plagued by noise. Humbucking pickups are just an incomplete (though crucial!) solution. The obvious option is always to float practicing the guitar pickup to a healthy result, being a microphone. A similar thought was printed this 2001 patent application like this Wireless Microphone System Vhf?