It depends. If you have two or more verticals for a phased antenna, and full length radials, the points where the ground systems intersect is where the radials should be terminated and bonded to copper strap running along the boundary where they cross each other. If you have an out building in the radial field, a strap is usually run around the foundation of the building, radials run up to that and bonded to it, then continued on out on the other side. These are methods prescribed in broadcast engineering texts, and what you'll find at a commercial ground system installation.
If you have one vertical and a ground system for it, you don't need to do anything. Some professionals terminate compromised lengths (i.e. < 1/4 wave) with short ground rods or strap but I am not sure there is any real benefit to that. If it were me, I'd put my money and effort into more radials rather than perimeter strap. 73 Rob K5UJ _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
