  The moir\'{e} effect provides an interpretation for the steering of antennas
that form beams through internal spatial interferences. We make an explicit
connection between such antennas and the moir\'{e} effect, and use it to model
six planar antennas that steer by scaling, rotating, or translating operations.
Three of the antennas illustrate how to use moir\'{e} patterns to generate
antenna designs.
