UHF Bi-Quad with NO Reflector (per khaye post) analyzed using 4nec2.
Element Diameter = 1/8-inch (AWG8), All Diamond Sides = 17 cm (6.7-in), Feedpoint Gap Size = 2 cm (0.78-in) [4nec2 model used 0.75-in] Outer Angles = 45.0-deg, Inner Angles = 54.5-deg (would be 45-deg for zero Gap Size). [AWG10 would slightly degrade SWR.]
Not quite optimum for New UHF Band (Ch14-51), with high SWR on Ch14. Improve by using about 10-percent longer side lengths: 18.7-cm (7.4-in).
Optimum size for Old UHF Band (Ch14-69) would be 16.3-cm (6.4-in) per side, shifting indicated performance at 770 up to 806 MHz.
Date(s): 13 Mar 2011. Album by holl_ands. 1 - 12 of 12 Total. 10182 Visits.
enlarge 64KB, 913x1024 1 UHF Bi-Quad, 17-cm/side, NO Reflector 3D View
enlarge 174KB, 643x1024 2 UHF Bi-Quad, 17-cm/side, NO Reflector Front View [1 small box = 1 centimeter]
enlarge 41KB, 161x1024 3 UHF Bi-Quad, 17-cm/side, NO Reflector Side View [1 small box = 1 centimeter]
enlarge 159KB, 1152x710 4 UHF Bi-Quad, 17-cm/side, NO Reflector UHF Raw Gain ~ 5.6 to 7.5 dBi
enlarge 189KB, 1152x710 5 UHF Bi-Quad, 17-cm/side, NO Reflector UHF SWR (300-ohms) Under 5.5