UHF+Hi-VHF Vertically Stacked mclapp M4 (9.5x9-in) 4-Bay Bowties with NO Reflector and Holl_ands Vertical Harness (HVH) was analyzed using 4nec2, with Zss = 42.75-in Vertical Stacking Separation between Antennas (Feedpoint-to-Feedpoint). Dimensions are the same as found for the Optimized version with the Double Angle Reflector.
UHF Raw Gain = 11.7 to 15.2 dBi, F/B & F/R = 0.3 to 0.6 dB and SWR (300-ohms) under 2.4. Hi-VHF Raw Gain = 7.1 to 7.9 dBi, F/B & F/R = 0.7 to 0.6 dB and SWR (300-ohms) 5.5 to 2.5 to 6.9
Many times Multipath will result in signal strength varying with height in alternating Peaks and Nulls. Zss was chosen so that when Nulls form across the Bowties on one Antenna, hopefully Peaks will form across the Bowties on the other. Hence they are NOT at equal spacing
Date(s): 27 Dec 2013. Album by holl_ands. 1 - 21 of 21 Total. 2531 Visits.
enlarge 75KB, 449x1024 1 Vert-Stack M4 (9.5x9) + NO Refl. 3D View
enlarge 150KB, 387x1024 2 Vert-Stack M4 (9.5x9) + NO Refl. Front View [1 large square = 5 inches]
enlarge 99KB, 298x1024 3 Vert-Stack M4 (9.5x9) + NO Refl. Side View [1 large square = 5 inches]
enlarge 159KB, 1024x650 4 Vert-Stack M4 (9.5x9) + NO Refl. UHF Raw Gain = 11.7 to 15.2 dBi UHF F/B & F/R = 0.3 to 0.6 dB Harness enhanced Gain on Highest Channels
enlarge 185KB, 1024x650 5 Vert-Stack M4 (9.5x9) + NO Refl. UHF SWR (300-ohms) Under 2.4
enlarge 165KB, 671x1024 15 Vert-Stack M4 (9.5x9) + NO Refl. Top View [1 large square = 2.5 inches]
enlarge 170KB, 1024x650 16 Vert-Stack M4 (9.5x9) + NO Refl. Hi-VHF Raw Gain = 7.1 to 7.9 dBi Hi-VHF F/B & F/R = 0.7 to 0.6 dB Harness Enhances Gain Towards the REAR
enlarge 191KB, 1024x650 17 Vert-Stack M4 (9.5x9) + NO Refl. Hi-VHF SWR (300-ohms) = 5.5 to 2.5 to 6.9 is Excessive on Lowest & Highest Channels
