To offer a "dome of protection", as indicated in the schematic on the left, circular-conduit structures are constructed high above the ground
and oriented at various positions, as shown on the right.  This places the magnetic field overhead of human astronauts without
immersing them within the magnetic field itself. 

Circular-conduit structures to create magnetic fields are integrated into a dome lattice which encompasses the
entire Moon Base.  The open dome lattice can be as large as an Earth structure, such as the Astrodome. 

Since Galactic Cosmic Rays come from all directions, an active magnetic field must either immerse the entire Moon Base or provide protection from
above and also radiation emanating from the horizon.  An option instead of a "dome shield" is to locate the Moon Base inside a crater, therefore using
the walls of the crater for protection against GCRs from the horizon.  On the right, overhead magnetic fields provide a "ceiling" over a crater and humans
do not have to be immersed in the EMF.  Two concentric conduits allow dividing the current and are simply constructed due to the Moon's 1/6 G.