Abstract: An electromagnetic energy concentrating dish (22) that comprises a contoured polymeric support (62) and a reflective surface (60). A contour (26) is determined that will reflect electromagnetic energy from reflective surface (60) to a receiver (36) set at focus region (28). A net or near net polymeric foam (100) is machined to form contoured polymeric support (62) having contour (26?). Reflective surface (60) is laid upon contoured polymeric support (62), and angles of reflection from reflective surface (60) adjust to reflect electromagnetic energy to focus region (28).