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Hi-VHF Shorted Bowtie Loop (w Reflector)
Hi-VHF Shorted Bowtie Loop with Reflector) analyzed using 4nec2.

Optimum Loop Diameter = 44-in with Half-Inch-Copper-Tubing for 48-in H x 48-in W Screen Reflector (1"x2" Grid).
This minimum Screen size was determined by size of typically available fencing material.
Angled Reflectors beyond the 48x48 Grid may be added to improve Gain by reducing Horiz. and/or Vert. Azimuthal coverage.

Optimum Diameter for smaller Element sizes may be slightly different.

Hi-VHF Raw Gain = 8.2 to 8.4 dBi, F/B & F/R Ratio = 14.4 to 13.0 dB and SWR (300-ohms) Under 2.5.
Date(s): 18 Sept 2009. Album by holl_ands. 1 - 9 of 9 Total. 6806 Visits.
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VHF Shorted Bowtie Loop with 48-in H x 48-in W Screen
Reflector (1x2) at 20-in Separation
3D View


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VHF Shorted Bowtie Loop (with Screen Reflector)
Front View [One small box = 1.0 inch]
Loop Diameter = 44-in with Half-Inch-Copper-Tubing


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VHF Shorted Bowtie Loop (with Screen Reflector)
Side View [One small box = 1.0 inch]


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VHF Shorted Bowtie Loop (with Screen Reflector)
Raw Gain = 8.3+ dBi for Ch7-13 with less in FM Band
Raw Gain rapidly falls for Ch2-6 & very poor SWR.


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VHF Shorted Bowtie Loop (with Screen Reflector)
SWR(300-ohm) is 2.0-2.5 for Ch7-13.
SWR is EXCESSIVE on Ch2-6.


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VHF Shorted Bowtie Loop (with Screen Reflector)
4nec2 File


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VHF Shorted Bowtie Loop (with Screen Reflector)
Hi-VHF Raw Gain = 8.2 to 8.4 dBi
Hi-VHF F/B & F/R Ratios = 14.4 to 13.0 dB


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VHF Shorted Bowtie Loop (with Screen Reflector)
Hi-VHF SWR (300-ohms) Under 2.5


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VHF Shorted Bowtie Loop (with Screen Reflector)
Hi-VHF Impedance


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This is a wealth of information.Thank You
 - 
JOSEPH J PHILLIPS, Sun, 13 Sep 2020 6:36AM