UHF Vertical 6-Bay Bowtie (FF6) + VDAR

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UHF Vertical 6-Bay Bowtie (FF6) + VDAR

UHF Vertical Free-Form 6-Bay Bowtie (FF6) with Variable Double Angle Reflector (VDAR) Analyzed using 4nec2.

Two versions are analyzed, with only minor differences between them:

===================================
a) FF6 (all 19 Variables Searched for Optimum) with Variable Double Angled Reflector (VDAR) (60"Hx36"W),
assuming Grid=2"Hx4"W [F/B & F/R Ratios improve if use 1"Hx2"W]:

UHF = 15.0 to 16.4 to 16.0 to 17.0 dBi, F/B & F/R Ratio Min = 15.2 dB and SWR (300-ohms) Under 1.7.
Hi-VHF Raw Gain = 9.1 to 8.0 dBi, F/B & F/R Ratio Min = 14.1 dB and SWR (300-ohms) = 17 to 13 is Excessive.

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b) One-Half of Separately Optimized Horiz-Stack 2xFF6's each with VDAR (60"Hx36"W),
assuming Grid=2"Hx4"W [F/B & F/R Ratios improve if use 1"Hx2"W]:

UHF Raw Gain = 14.7 to 16.7 to 16.3 to 16.8 dBi, F/B & F/R Ratio Min = 16 dB and SWR (300-ohms) Under 1.7.
Hi-VHF Raw Gain = 10.1 to 8.4 dBi, F/B & F/R Ratio Min = 15.4 dB and SWR (300-ohms) = 5.6 to 16.2 to 14.0
is Excessive.

EDIT (23Mar2016): Added Dimensioned Drawing for Bowtie Portion of FF6+VDAR, version (a).
Instructions for VDAR is "Angled Reflector" found on mclapp's website:
http://m4antenna.eastmasonvilleweather.com/Drawings/PDF%20Drawings.html

Date(s): 29 Sep 2015. Album by holl_ands. 1 - 51 of 51 Total. 11515 Visits.

enlarge 168KB, 613x1024 1 UHF 6-Bay Bowtie with VDAR - OPT 3D View	enlarge 330KB, 841x1024 2 UHF 6-Bay Bowtie with VDAR - OPT Front View [1 large square = 5 inches]	enlarge 165KB, 519x1024 3 UHF 6-Bay Bowtie with VDAR - OPT Top View [1 large square = 2.5 inches]
enlarge 175KB, 1024x722 4 UHF 6-Bay Bowtie with VDAR - OPT UHF = 15.0 to 16.4 to 16.0 to 17.0 dBi UHF F/B & F/R Ratio Min = 15.2 dB	enlarge 175KB, 1024x722 5 UHF 6-Bay Bowtie with VDAR - OPT UHF SWR (300-ohms) Under 1.7	enlarge 232KB, 1024x722 6 UHF 6-Bay Bowtie with VDAR - OPT UHF Impedance
enlarge 298KB, 1024x1024 7 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 470 MHz	enlarge 297KB, 1024x1024 8 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 530 MHz	enlarge 298KB, 1024x1024 9 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 590 MHz
enlarge 296KB, 1024x1024 10 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 650 MHz	enlarge 296KB, 1024x1024 11 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 698 MHz	enlarge 299KB, 1024x1024 12 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 806 MHz
enlarge 289KB, 1024x1024 13 UHF 6-Bay Bowtie with VDAR - OPT Elevation Pattern at 470 MHz	enlarge 288KB, 1024x1024 14 UHF 6-Bay Bowtie with VDAR - OPT Elevation Pattern at 530 MHz	enlarge 291KB, 1024x1024 15 UHF 6-Bay Bowtie with VDAR - OPT Elevation Pattern at 590 MHz
enlarge 293KB, 1024x1024 16 UHF 6-Bay Bowtie with VDAR - OPT Elevation Pattern at 650 MHz	enlarge 298KB, 1024x1024 17 UHF 6-Bay Bowtie with VDAR - OPT Elevation Pattern at 690 MHz	enlarge 293KB, 1024x1024 18 UHF 6-Bay Bowtie with VDAR - OPT Elevation Pattern at 806 MHz
enlarge 174KB, 1024x722 19 UHF 6-Bay Bowtie with VDAR - OPT Hi-VHF Raw Gain = 9.1 to 8.0 dBi Hi-VHF F/B & F/R Ratio Min = 14.1 dB	enlarge 188KB, 1024x722 20 UHF 6-Bay Bowtie with VDAR - OPT Hi-VHF SWR (300-ohms) = 17 to 13 is Excessive	enlarge 217KB, 1024x722 21 UHF 6-Bay Bowtie with VDAR - OPT Hi-VHF Impedance
enlarge 305KB, 1024x1024 22 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 174 MHz	enlarge 302KB, 1024x1024 23 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 198 MHz	enlarge 302KB, 1024x1024 24 UHF 6-Bay Bowtie with VDAR - OPT Azimuthal Pattern at 216 MHz
enlarge 155KB, 1024x733 25 UHF 6-Bay Bowtie with VDAR - OPT Parametric Sensitivity Study Raw Gain vs Hop Distance: 698 MHz [Separation between Feedlines at Crossovers] Hop=1.0-in Assumed for Optimization Lose 0.3 dBi if Squeeze Down to 0.1-in	enlarge 182KB, 1024x733 26 UHF 6-Bay Bowtie with VDAR - OPT Parametric Sensitivity Study SWR (300-ohms) vs Hop Distance: 698 MHz [Separation between Feedlines at Crossovers] Hop=1.0-in Assumed for Optimization Degrade SWR if Squeeze Down to 0.1-in	enlarge 204KB, 1024x733 27 UHF 6-Bay Bowtie with VDAR - OPT Parametric Sensitivity Study Impedance vs Hop Distance: 698 MHz
enlarge 250KB, 768x1024 28 UHF 6-Bay Bowtie [JUST Bowties] FLAT View [Prior to FWD/REV Bow Sweeps] [1 large square = 5 inches]	enlarge 114KB, 791x1024 29 UHF 6-Bay Bowtie with VDAR - OPT 4nec2 File Includes Summary of Dimensions	enlarge 90KB, 791x1024 30 UHF 6-Bay Bowtie with VDAR - OPT EVAL *.html Performance Summary
enlarge 176KB, 596x1024 31 UHF 6-Bay Bowtie with VDAR (Half) 3D View	enlarge 329KB, 838x1024 32 UHF 6-Bay Bowtie with VDAR (Half) Front View [1 large square = 5 inches]	enlarge 165KB, 517x1024 33 UHF 6-Bay Bowtie with VDAR (Half) Top View [1 large square = 2.5 inches]
enlarge 180KB, 1024x722 34 UHF 6-Bay Bowtie with VDAR (Half) UHF Raw Gain = 14.7 to 16.7 to 16.3 to 16.8 dBi UHF F/B & F/R Ratio Min = 16 dB	enlarge 181KB, 1024x722 35 UHF 6-Bay Bowtie with VDAR (Half) UHF SWR (300-ohms) Under 1.7	enlarge 231KB, 1024x722 36 UHF 6-Bay Bowtie with VDAR (Half) UHF Impedance
enlarge 299KB, 1024x1024 37 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 470 MHz	enlarge 300KB, 1024x1024 38 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 530 MHz	enlarge 297KB, 1024x1024 39 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 590 MHz
enlarge 298KB, 1024x1024 40 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 650 MHz	enlarge 303KB, 1024x1024 41 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 698 MHz	enlarge 302KB, 1024x1024 42 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 806 MHz
enlarge 184KB, 1024x722 43 UHF 6-Bay Bowtie with VDAR (Half) Hi-VHF Raw Gain = 10.1 to 8.4 dBi Hi-VHF F/B & F/R Ratio Min = 15.4 dB	enlarge 194KB, 1024x722 44 UHF 6-Bay Bowtie with VDAR (Half) Hi-VHF SWR (300-ohms) = 5.6 to 16.2 to 14.0 is Excessive.	enlarge 220KB, 1024x722 45 UHF 6-Bay Bowtie with VDAR (Half) Hi-VHF Impedance
enlarge 304KB, 1024x1024 46 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 174 MHz	enlarge 300KB, 1024x1024 47 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 198 MHz	enlarge 300KB, 1024x1024 48 UHF 6-Bay Bowtie with VDAR (Half) Azimuthal Pattern at 216 MHz
enlarge 118KB, 344x1024 49 UHF 6-Bay Bowtie with VDAR (Half) Side View [1 large square = 5 inches]	enlarge 118KB, 791x1024 50 UHF 6-Bay Bowtie with VDAR (Half) 4nec2 File Includes Summary of Dimensions	enlarge 90KB, 791x1024 51 UHF 6-Bay Bowtie with VDAR (Half) EVAL *.html Performance Summary

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The top view and the 3D appear to show a larger length difference between the 2 outermost sets of tines. However, your dimensional drawing says there is only a 1/8" difference (12.5 vs 12.625) Which is correct? Thanks.
- Charles Johnson, Fri, 3 Jun 2016 6:11PM

Thanks for the drawing of the FF6+VDAR. It couldn't have come at a better time as I am just in the throws of building this antenna.
- TVJim, Fri, 25 Mar 2016 12:31PM