VLF antenna base insulator model tests

The report summarizes an investigation of alternate base insulator designs for VLF transmitting antenna towers. The investigation encompassed three principal tasks: measure the voltage distribution and capacitance of three candidate insulator designs under conditions which simulate the Lualualei, Hawaii and Annapolis, Maryland transmitting sites; modify the three candidate designs by changing the configuration of corona shields and/or rain shields to attain an equal voltage distribution across multisection insulators; and modify one or more designs for optimum rain protection, under the prevailing environmental conditions at the Lualualei site.