N7BB_KMHD-6el yagi
Free Space Symmetric
89.100 MHz
14 6061-T6 wires, inches
rfs = -16		; org space = -18.0" - 16.0
des = .001		; org space = .000"
drs1 = 5		; org space = 8.25"  - 5.0  
drs2 = 49.125		; opr space = 45.5"  - 49.125  	
drs3 = 67.875		; add space = 69.5"  - 67.875
drs4 = 89		; add space = 87.0"  - 89.00
dia = .392		; dia for Driven Element
dia1 = .375		; 3/8" for ALL OTHER ELEMENTS
rfl = 32		; org length = 31.5"  - 32.0
dr1 = 29.5		; org length = 28.50" - 29.50 
dr2 = 29.75		; org length = 28.75" - 29.75 
dr3 = 28.75		; org length = 28.75" - 28.75
dr4 = 29.5		; org length = 28.50" - 29.50
len = 27.75		; drv el half-length; org length = 27.75"
sp = 1.824		; drv el upside spacing: c/b = 1.824"
nsp = -1.46		; drv el downside spacing: c/b = -1.46"

 1   0     -len   nsp   0      len   nsp    dia
 1   0     -len   sp    0      len    sp    dia
 1   0     -len   sp    0     -len   nsp    dia
 1   0      len   sp    0      len   nsp    dia
 1   rfs    -rfl   0    rfs     0.0    0    dia1
 1   rfs     0.0   0    rfs     rfl    0    dia1 
 1   drs1   -dr1   0    drs1    0.0    0    dia1
 1   drs1    0.0   0    drs1    dr1    0    dia1 
 1   drs2   -dr2   0    drs2    0.0    0    dia1
 1   drs2    0.0   0    drs2    dr2    0    dia1 
 1   drs3   -dr3   0    drs3    0.0    0    dia1
 1   drs3    0.0   0    drs3    dr3    0    dia1
 1   drs4   -dr4   0    drs4    0.0    0    dia1
 1   drs4    0.0   0    drs4    dr4    0    dia1
 1 source
 Wire 1, center

 This antenna started from the stock Stellar Labs 4el el FM Antenna. Two (2) 
 dir elements were added and the boom streched to 8' 9" + 2" = 8ft 11".
 The AO analysis shows;
  10.7 db F/G 
   8.1 db F/B
  300 ohm feed impedance- swr due to match; 302 - j 8 
  SWR = 1.03:1

 To receive the FM station from Portland, OR @ 89.1Mhz - KMHD FM 

 The antenna has a 300 to 75 stripline transformer built into the feed point
 making the transmission line (RG-6) a better way to send the signal to my
 FM tuner. Add three (3) ferrite line chokes (apx 1100 ohms) at the feed 
 point to further attenuate the common mode signal.  
 
 Where N7BB lives F/G is more important than F/B ratio b/c of distance to 
 KMHD's xmitter site . . . 111 miles. Need all the F/G that he can get!