Fixed-wing aircraft (just about all of them!) have static wicks to dissipate static charge buildups before they can become obnoxious or shocking. Are helicopters fitted with them? This answer suggests they are not.
Static wicks are mostly found on aircraft that fly in Instrument Meteorological Conditions because static charges typically build up when flying in precipitation, not in clear air.
So you won't find static wicks on helicopters that are certified only for visual conditions, like the R-22, R-44, Bell 206, piston Enstroms, etc., but you will find static wicks on helis that are certified for IFR.
[Static wicks] are used on aircraft to allow the continuous satisfactory operation of onboard navigation and radio communication systems during precipitation (p-static) conditions. Precipitation static is an electrical charge on an airplane caused by flying through rain, snow, ice, or dust particles. When the aircraft charge is great enough, it discharges into the surrounding air. http://en.wikipedia.org/wiki/Static_discharger