The manual page yagi.1 describes all the options of yagi. The manual page yagi.5 describes the binary file format written by yagi. However, it is better to read this page before looking at the man pages.
In the description on the programme first,
there is an example of a 5 element Yagi-Uda antenna being created and saved
in a file called example1. This will be analysed with yagi now
parrot /export/home/drkirkby/yagiuda-1.18/src % yagi example1
yagi compleated 0.0% f=144000000.000000 MHz
yagi compleated 5.0% f=144100000.000000 MHz
yagi compleated 10.0% f=144200000.000000 MHz
yagi compleated 15.0% f=144300000.000000 MHz
yagi compleated 20.0% f=144400000.000000 MHz
yagi compleated 25.0% f=144500000.000000 MHz
yagi compleated 30.0% f=144600000.000000 MHz
yagi compleated 35.0% f=144700000.000000 MHz
yagi compleated 40.0% f=144800000.000000 MHz
yagi compleated 45.0% f=144900000.000000 MHz
yagi compleated 50.0% f=145000000.000000 MHz
yagi compleated 55.0% f=145100000.000000 MHz
yagi compleated 60.0% f=145200000.000000 MHz
yagi compleated 65.0% f=145300000.000000 MHz
yagi compleated 70.0% f=145400000.000000 MHz
yagi compleated 75.0% f=145500000.000000 MHz
yagi compleated 80.0% f=145600000.000000 MHz
yagi compleated 85.0% f=145700000.000000 MHz
yagi compleated 90.0% f=145800000.000000 MHz
yagi compleated 95.0% f=145900000.000000 MHz
yagi compleated 100.0% f=146000000.000000 MHz
That is it - the antenna currents have been calculated
and saved to a file. The results are in a binary file called example1.out.
In order to see how well the antenna performs (gain, FB ratio etc.) we
must use the programme output. For
more information on the options to yagi, see the manual page
yagi.1