根据这个文件，做一个这个最优解的九段引向器的.nec2

bash -lc cat > '/mnt/data/optimal_9_director_yagi_300MHz.nec2' <<'EOF' CM Optimal 9-director Yagi-Uda antenna for NEC2 / 4nec2 CM Derived from uploaded file: minyang chen.nec2 CM Frequency sweep: 250 to 350 MHz, 61 steps, step = 1.6666667 MHz CM Units: metres. Free-space model. All wires radius = 0.004 m (8 mm diameter). CM Element axes are parallel to z; boom axis is x. Forward radiation is toward +x. CM Geometry table: tag, x-centre, total length CM Reflector tag 1 x=-0.220 m L=0.490 m CM Driven element tag 2 x= 0.000 m L=0.472 m CM Director 1 tag 3 x= 0.160 m L=0.435 m CM Director 2 tag 4 x= 0.320 m L=0.425 m CM Director 3 tag 5 x= 0.500 m L=0.418 m CM Director 4 tag 6 x= 0.680 m L=0.412 m CM Director 5 tag 7 x= 0.880 m L=0.407 m CM Director 6 tag 8 x= 1.100 m L=0.402 m CM Director 7 tag 9 x= 1.330 m L=0.398 m CM Director 8 tag 10 x= 1.570 m L=0.395 m CM Director 9 tag 11 x= 1.820 m L=0.392 m CE CM Reflector GW 1 21 -0.220 0 -0.2450 -0.220 0 0.2450 0.0040 CM Driven element GW 2 21 0.000 0 -0.2360 0.000 0 0.2360 0.0040 CM Director 1 GW 3 21 0.160 0 -0.2175 0.160 0 0.2175 0.0040 CM Director 2 GW 4 21 0.320 0 -0.2125 0.320 0 0.2125 0.0040 CM Director 3 GW 5 21 0.500 0 -0.2090 0.500 0 0.2090 0.0040 CM Director 4 GW 6 21 0.680 0 -0.2060 0.680 0 0.2060 0.0040 CM Director 5 GW 7 21 0.880 0 -0.2035 0.880 0 0.2035 0.0040 CM Director 6 GW 8 21 1.100 0 -0.2010 1.100 0 0.2010 0.0040 CM Director 7 GW 9 21 1.330 0 -0.1990 1.330 0 0.1990 0.0040 CM Director 8 GW 10 21 1.570 0 -0.1975 1.570 0 0.1975 0.0040 CM Director 9 GW 11 21 1.820 0 -0.1960 1.820 0 0.1960 0.0040 GE 0 GN -1 EK LD 5 0 0 0 5.8E7 EX 0 2 11 0 1 0 FR 0 61 0 0 250 1.6666667 XQ EN EOF wc -l '/mnt/data/optimal_9_director_yagi_300MHz.nec2' && sed -n '1,140p' '/mnt/data/optimal_9_director_yagi_300MHz.nec2'

Thought for 38s