This is the 4NEC2 antenna bend model for: EFHW Inverted-L
To use this model:
Below. Highlight and copy (Ctrl C) the program control codes (CM,
CE, SY, etc).
Open Windows Wordpad and copy (Ctrl V) the control codes into Wordpad.
Go to "File, Save as..." and name your new antenna model.
In Windows Explorer, right-click on your new model and "Rename" the file to end as ".nec".
Open your new model to alter the L-height (hgh), L-bend ratio (R), angle of upward wire (lat2).
4NEC2 is an NEC2, NEC4, Windows based antenna modeler and optimizer by
It is available free of charge at: www.qsl.net/4nec2/
CM Standardized OCF vertical for 2-radial model converted to EFHW with variable bend point and angles
CM #14 AWG. Over Real ground, Element height fixed at 12 meters. Variable feedpoint height.
CM L-bend ratio is adjustable based on Length. 0.5=center.
CM End-fed so use short counterpoise and small inductance for vhf tuning.
CM Arm longitude (lon1-lon2) is fixed to North-South
CM Arm lattitude (lat 2) is adjustable for angle of vertical wire.
CM Dick Reid, KK4OBI, 2017
SY hgh=12.2 'Fixed maximum height of any element at 40 ft =12.2 meters
SY L=37.44535 'Length optimized as meters of resonant straight half=-wave at 3.8 mHz
SY R=0.3 'Enter bendpoint ratio of inv-V or inv-L (0.5 = center)
SY cp=4.534867 'optimized counterpoise length - meters
SY rad1=L*(1-R) 'Length of L-Radial 1 - meters
SY rad2=L-rad1 'Length of L-Radial 2 with counterpoise - meter
SY lat2=0 'degrees angle of vertical wire 0=dn, 90=side
SY lon1=0 'longitude L-Radial 1 fixed to North=0
SY lon2=180 'longitude L-Radial 2 fixed to South=180
GW 1 25
0 0 hgh
rad1 0 hgh
#14 'Arm 1
GW 2 25
0 0 hgh
hgh-rad2*cos(lat2) #14 'Arm 2
GW 3 3
hgh-rad2*cos(lat2) #14 'counterpoise
LD 0 2
24 24 0 0.000001
GN 2 0 0 0 4 0.003
EX 0 2
25 0 1
FR 0 0 0 0 28.4 0