Corner Reflector Arrays for VHF and UHF. 


                                   ^  /                      |           
                                 .  o            ------------|-----------
                               .  /                          |           
                             .  o                ------------|-----------    
                           .  /|                             |
                         .  o ||                 ------------|-----------
                       S  /   ||                             |
                     .  o     ||                 ------------|-----------
                   .  /       ||                             |
                 .  o         ||                 ------------|-----------
    Feed       .  /           ||                             |
    Line     .  o<-.          ||                 ------------|-----------
    v       v /    .V         ||                             |
    ------ .->O--------------->O<--Dipole center--->---------|---------
          /  :\    .          ||                             |
  Hinge  /   :  o<-           ||                 ------------|-----------
  (optional) :    \           ||                             |
             :<---- o D ----->||<center          ------------|-----------
                      \       ||                             |
                        o     ||                 ------------|-----------
                          \   ||                             |
                         ^  o ||. G .            ------------|-----------
             Center support   \|v   |                        |
             (Wood or metal)    o   |            ------------|-----------
                                  \ v                        |
                                    o            ------------|-----------
                                      \          ^           |          ^
                                                 |......................|
                                                             L

Demensions:
----------------------------------------------------------------
     |Side   |Dipole to |Reflector |Reflector |Corner |Radiation
Ferq,|length |vertex    |length    |spacing   |angle  |resistance
MHz  |S,in.  |D, in.    |L, in.    |G, in.    |V Deg. |Ohms

144*  65      27 1/2     48         7 3/4      90      70
144   80      40         48         4          90     150
222*  42      18         30         5          90      70
222   52      25         30         3          90      70
222  100      25         30         Screen     60      70
440   27       8 3/4     16 1/4     2 5/8      90      70
440   54      13 1/2     16 1/4     Screen     60      70
915   20       6 1/2     25 3/4     0.65       90      70
915   51      16 3/4     25 3/4     Screen     60      65
915   78      25 3/4     25 3/4     Screen     45      70
1296  18       4 1/2     27 1/2     1/2        90      70
1296  48      11 3/4     27 1/2     Screen     60      65
1296  72      18 1/4     27 1/2     Screen     45      70
2304  15 1/2   2 1/2     20 1/2     1/4        90      70
2304  40       6 3/4     20 1/2     Screen     60      65
2304  61      10 1/4     20 1/2     Screen     45      70

* Side length and number of reflector elements somewhat below
  optimum--slight reduction in gain.

Notes:
915 MHz
Wavelenght is 12.9 in.
Side length S is 3 x D, dipole to vertex distance
Reflector length L is 2.0 wavelength
Reflector spacing G is 0.05 wavelength

1296 MHz
Wavelength is 9.11 in.
Side length S is 4 x D, dipole to vertex distance
Reflector lenght L is 3.0 wavelength
Reflector spacing G is 0.05 wavelength

2304
Wavelenght is 5.12 in.
Side lenght S is 6 x D, dipole to vertex distance
Reflector lenght L is 4.0 wavelength
Reflector spacing G is 0.05 wavelength

Reflector element spacing, G, is the maximum that should be used for the
frequency; closer spacing are optional. 

A dipole radiation is usually employed with a corner reflecter. This 
requites a balum between the coaxial line and the balanced feed-point
impedance of the antenna. 

This antenna offers 10 to 15 db gain, depending on the angle and size.
The corner angle can be 90, 60 or 45 deg. For 90 deg. driven element
spacing 0.25 to 0.7 wavelength, 60 deg. is 0.35 to 0.75 wavelength,
45 deg. 0.5 to 0.8 deg. the gain will flux 1.5 db.

---------------------------------------------------------

  Some Antennas only come shown in inch & foot measurements so use this to 
  convert to cm.

  Converting English Measurements to Metric - 1 inch (1") = 2.54  cm
                                              1 foot (1') = 30.48 cm
  Example: 42" X 2.54 = 106.7


This section was witten by Paul M. Wllson W4HHK
Thanks to the ARRL Antenna Book
Sent by Jack - KE4IQQ AAAC #1
Address: @ KF4BPX.#OKE.FL.USA.NOAM