This version (v 1.12) of the program is entirely based on the material con- tained in the 1984 edition of the ARRL Antenna Book. Future versions may include other design criteria from other sources; QST and other journals from the 1930s had much material on this most useful beam antenna. The program outputs dimensions and other data for the rhombic you want. At the end, this info is expressed in terms of x,y,z coordinates (in meters) for entering into an antenna analysis program like Elnec. The metric system has been declared "legal" in the U.S. since about 1870, so maybe it's time to throw away this inches and feet business. Get a tape measure that measures in meters. We're almost in the 21st century!