GPR-Expert.com - The communications and power industries' most highly regarded website dedicated solely to protection of communications equipment and personnel from ground potential rise caused by power system faulting and lightning strike energy

PolyPhaser Corporation  
Has the best antenna grounding methodology in the USA.   Manufactures grounding equipment, coaxial cable protection equipment, telephone line protection equipment (shunting devices), and bulkhead panels.

Pepro  The leading manufacturer of patented shielded enclosure systems for your mission critical and remote communication needs.

Northern Technologies, Inc. Manufacturers of solid-state shunting devices for the power and communications industry:

Lightning Injury Research Program An informational and educational tool for survivors of lightning strike and the physicians who treat them as well as a safety resource for those responsible for organizing outdoor activities

Bond Washer  Manufacturer of NO-ISSUE dual hole double connection Bond Washers for sure grounding of bar connections

Ingenuity Industries Inc. Bringing clever ideas to the electric industry market

Harger Lightning Protection and Grounding Manufacturers since 1960

University of Florida Lightning Research Group  Useful lightning research information.