Plane reflector: Is square. Is 18 inchs square. Waveguide (can): Is round. Is 9.33 inchs in diameter. Is 15.5 inchs long. The back end of the waveguide is located 2.34 inchs above the plane reflector. Probe: Is parallel to the bottom of the can. Is vertical with respect to earth. Is 5 and 29/32" from the back of the can. Is 3 and 11/32" long including the brass part of the N-Type connector. Notes: When using wire mesh at these frequencies use mesh that is a minimum of 1 inch mesh. I strongly recommend 1/4 or 1/8 inch mesh. -m-