Yes. Parametric design is possible by running a Bulk Simulation >. We prefer that the user chooses the programming language to generate a sequence of files in NEC format with one or more variable parameters. Calculations on these files can then be run automatically in bulk. Scilab > is a free numerical calculation software tool with which we can program scripts that generate multiple descriptions of an antenna with variable parameters. Download an example of a Yagi-Uda antenna with variable element spacing from this link >.