Stacked 3 Element Yagis Optimized for Pattern
Free Space
14.175 MHz
6 wires, inches
22      -128.429 -207.860 0      -128.429  207.860 0       1.000
22       -15.386 -199.407 0       -15.386  199.407 0       1.000
22       128.429 -188.065 0       128.429  188.065 0       1.000
22      -128.429 -207.860 44'    -128.429  207.860 44'     1.000
22       -15.386 -199.407 44'     -15.386  199.407 44'     1.000
22       128.429 -188.065 44'     128.429  188.065 44'     1.000
2 sources
32,100,0
95,100,0
0 loads

Compare this with 3ELYAGI.ANT, the single Yagi antenna file.  For small beams
not much spacing is needed to realize 3 dB stacking gain.  Note how the badly
the rear pattern deteriorates due to the presence of the second antenna.  The
parasitic lengths should be reoptimized for the stacking environment.  This
antenna provides an alternative to a long boom 6 element Yagi having similar
gain but narrower beamwidth.  Use 10 segments per element for faster compute.