Hi-VHF 2-Bay Bowtie analyzed using 4nec2 to find "quasi-optimized" dimensions.
a) For Best overall performance use following Dimensions [44" H x 61" W]: BowLength=30in, BowSeparation=29in, TineSeparation=15in, FeedlineSeparation=3.0-in and ALL AWG10 (or larger) wire size.
Hi-VHF Raw Gain = 6.7 to 9.3 dBi and SWR (300-ohms) Under 2.6.
================================== b) To MINIMIZE Hi-VHF SWR at expense of Hi-VHF Gain and even worse Lo-VHF SWR: BowLength=27in, BowSeparation=26in, TineSeparation=13.5in, FeedlineSeparation=3.0-in and ALL AWG10 wire size.
Hi-VHF Raw Gain = 5.7 to 8.1 dBi and SWR (300-ohms) Under 1.7.
================================== c) Following dimensions are a compromise, maximizing Hi-VHF Gain and Lo-VHF SWR at the expense of a slightly higher Hi-VHF SWR. Quasi-Optimum sizes for ALL AWG10 Wire sizes (49-in H x 66-in W): BowLength=33in, BowSeparation=32in, TineSeparation=17in, FeedlineSeparation=1.5-in and ALL AWG10 wire size.
Hi-VHF Raw Gain = 7.6 to 10 dBi and SWR (300-ohms) Under 3.5 [EXCESSIVE]. Performance in UHF Band was also analyzed...yes, there is Gain, but it is very inconsistent in beam direction.
================================== UPDATE (6Jul2016): Expanded (29x30) alternative and moved up to first (preferred) position.
Date(s): 1 Apr 2010. Album by holl_ands. 1 - 33 of 33 Total. 35680 Visits.
enlarge 63KB, 1006x1024 1 Hi-VHF 2-Bay (30x29) Bowtie 3D View
enlarge 221KB, 1024x676 2 Hi-VHF 2-Bay (30x29) Bowtie Front View [1 large square = 5 inches]
enlarge 39KB, 150x1024 3 Hi-VHF 2-Bay (30x29) Bowtie Top View [1 large square = 5 inches]
enlarge 126KB, 1024x648 4 Hi-VHF 2-Bay (30x29) Bowtie Hi-VHF Raw Gain = 6.7 to 9.3 dBi
