CM LoRa/LoRaWAN tutorial 42
CM https://www.mobilefish.com/developer/lorawan/lorawan_quickguide_tutorial.html
CM https://www.mobilefish.com/download/lora/monopole_ground_plane_868mhz_4nec2.nec.txt
CM 1/4 wavelength monopole 868MHz with perfect ground
CM Monopole length = 82mm 
CM Wire diameter = 1.8mm
CM Feedpoint at bottom of monopole
CM --------
SY length=0.082
CE
GW	1	9	0	0	0	0	0	length	9.e-4
GE	0
LD	5	0	0	0	5.8e7	0
EX	0	1	1	0	1	0
GN	1
FR	0	1	0	0	868	0