This article is not exactly about MFD, but there is some info that might be of benefit.
http://www.vlf.it/ed/earthprobes.html
The first thing that crossed my mind about the "cool breeze" feeling was the capacitor has ion charge. "Capacitance is ion seperation." Tuning a radio station without the speaker hooked up is not psychic, most people can feel ionic charge if they hold their hand near an ion generator. From what I have read this sensation is from tiny vortices of ions that are attracted to you. "Individual ions tend to drag surrounding air with them when they move."