For these home made antennas I used YagiMax antenna software to calculate the antenna dimensions, all dimensions are in the English system of measurements, the antenna theory was derived from a good used book I bought for $1.50 at the Salvation Army store in Yuba City California, "Electronics Communication", Second Edition (Robert L. Shrader) 1959 McGraw-Hill Inc., practical testing and fine tuning was completed with the help of WA6WGQ Robert(Bob) Hilderman.  Most of these designs call for .500 inch or smaller aluminium tubing for building materials.  Please send all comments, suggestions to Tibor_G_Balogh@HotMail.com or tibor@ecst.csuchico.edu.
 

Theory of operation for (n) element Yagi (beam) antenna on any frequency

   a     b   c     d     e      (a) Reflector --> .524w approx
   |     |   |     |     |      (b) Driver   ---> .499w approx
   |     |   |     |     |      (c) Director ---> .474w approx .469w approx
   | .2w |.1w| .2w | .2w |      (e) Director ---> .464w approx
   |     |   |     |     |      (w) = (m/s)/(w/s) = m/w (wave length)
   |     |   |     |     |      (w) =   c  /  hz  = m/w (wave length)
 
 

11 meter 27.205 Mhz 3 element Yagi (beam) antenna

(a) Reflector.... = 215.125 inches
(b) Driver....... = 203.750 inches
(c) Director..... = 195.750 inches
(1) Distance a->b =  85.875 inches
(2) Distance b->c =  42.875 inches
    Expected Gain =   7.110  DBI

6 meter 52 Mhz 3 element Yagi (beam) antenna

(a) Reflector.... = 102.500 inches
(b) Driver....... = 105.750 inches
(c) Director..... = 101.125 inches
(1) Distance a->b =  45.000 inches
(2) Distance b->c =  22.500 inches
    Expected Gain =   7.120 DBI

2 meter 146 Mhz 3 element Yagi (beam) antenna

(a) Reflector.... = 40.000 inches
(b) Driver....... = 37.000 inches
(c) Director..... = 35.000 inches
(1) Distance a->b = 16.000 inches
(2) Distance b->c =  8.000 iches
    Expected Gain =  7.170 DBI

1.25 meter 223 Mhz 3 element Yagi (beam) antenna

(a) Reflector.... = 26.125 inches
(b) Driver....... = 23.875 inches
(c) Director..... = 22.500 inches
(1) Distance a->b = 10.500 inches
(2) Distance b->c =  5.250 inches
    Expected Gain =  7.200 DBI

.7 meter 435 Mhz 3 element Yagi (beam) antenna

(a) Reflector.... = 13.375 inches
(b) Driver....... = 12.000 inches
(c) Director..... = 11.125 inches
(1) Distance a->b =  5.375 inches
(2) Distance b->c =  2.625 inches
    Expected Gain =  7.230 DBI

.36 meter 850 Mhz 3 element Yagi (beam) antenna (Cellular Phones A+B)

(a) Reflector.... =  6.750 inches
(b) Driver....... =  5.875 inches
(c) Director..... =  5.375 inches
(1) Distance a->b =  2.750 inches
(2) Distance b->c =  1.375 iches
    Expected Gain =  7.200 DBI

.33 meter 915 Mhz 3 element Yagi (beam) antenna (Cellular Phones)

(a) Reflector.... =  6.250 inches
(b) Driver....... =  5.500 inches
(c) Director..... =  5.000 inches
(1) Distance a->b =  2.500 inches
(2) Distance b->c =  1.250 inches
    Expected Gain =  7.190 DBI

.23 meter 1270 Mhz 3 element Yagi (beam) antenna

(a) Reflector.... =  4.500 inches
(b) Driver....... =  3.750 inches
(c) Director..... =  3.375 inches
(1) Distance a->b =  1.750 inches
(2) Distance b->c =  0.875 inches
    Expected Gain =  7.250 DBI

.125 meter 2400 Mhz 3 element Yagi (beam) antenna (WiFi LAN)

(a) Reflector.... =  2.375 inches
(b) Driver....... =  1.750 inches
(c) Director..... =  1.500 inches
(1) Distance a->b =  1.000 inches
(2) Distance b->c =  0.500 inches
    Expected Gain =  4.01 DBI
 
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