Do helicopters use static wicks?
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