... , Microwave & TV), cranes, hoists, smokestacks, buildings, sport stadiums, light pylons, high voltage towers and any other potentially hazardous obstructions to air ... : High building, tower, crane, high chimney, lighthouse, high voltage cable tower, oil well, etc.Standard: MH-T 6012-1999; ICAO Annex 14Certificate: SABS certificate Telecommunication Tower Light ...