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void usage_input(char *exefile)
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fprintf(stderr,"\nYagi-Uda antenna analysis programs, version %.2f\n", version());
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fprintf(stderr,"Written by David Kirkby BSc MSc G8WRB (email:david.kirkby@onetel.net)\n");
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fprintf(stderr, "\nUSAGE: %s [-h] \n\n", exefile);
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fprintf(stderr, "Where the only option is:\n");
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fprintf(stderr, " -h Print this help screen\n\n\n");
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fprintf(stderr,"'input' is an interactive program, that asks the user for formation about \n");
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fprintf(stderr,"a Yagi design, such as position of elements, spacing between elements,\n");
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fprintf(stderr,"frequency span of interest and a filename to save the data to. It then \n");
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fprintf(stderr,"writes this information into an ASCII file, which can be read by 'yagi' or \n");
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fprintf(stderr,"'optimise'. The file is ASCII and it's format is easily understood\n");
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fprintf(stderr,"by inspection (there are comments printed in it), so it can if necessary\n");
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fprintf(stderr,"be edited manually. After running 'input' and specifying a filename \n");
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fprintf(stderr,"(for example 144e10) you should then type 'yagi 144e10' then 'output 144e10'\n");
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fprintf(stderr,"and then and optionally 'optimise 144e10'.\n");