mclapp's M4 (9-5x9) Super-4-Bay Bowtie, with No Reflector, optimized for New UHF Band (Ch14-51): http://m4antenna.eastmasonvilleweather.com/Computer%20models/Computer%20models.html http://m4antenna.eastmasonvilleweather.com/Drawings/PDF%20Drawings.html http://www.youtube.com/watch?v=M8jsDxNgHn4
UHF Raw Gain is 8.5-12.2 dBi and SWR under 4.0. Hi-VHF Raw Gain is 3.5 dBi and SWR under 2.7.
FYI: Performance comparisons (No Reflectors): http://www.frontiernet.net/~mclapp/Antennas/4baystuff/no%20reflector%20antenna%20test.GIF And various with Reflectors: http://www.frontiernet.net/~mclapp/Antennas/plots/4%20bay%20compare11-23-08.xls
BowLength = 9.5-in (AWG8), Bowtie Spacing = 9.0-in, Tine Separation = 5.5-in. Feedline Separation = 1.25-in, including at Crossover (AWG10). Simulated Balun with 0.44-in SOURCE wire.
Sweeping Bowties Forward was ineffective in increasing Gain, other than a small increase above Ch51.
Date(s): 6 Sep 2009. Album by holl_ands. 1 - 25 of 25 Total. 23619 Visits.
enlarge 50KB, 393x1024 1 mclapp's M4 (9.5x9.0) Super-4-Bay 3D View
enlarge 208KB, 1024x690 2 mclapp's M4 (9.5x9.0) Super-4-Bay UHF Raw Gain for BowSwp=0.0 thru 3.0. BowSwp ineffective except minor increase above Ch51.
enlarge 247KB, 731x1024 4 mclapp's M4 (9.5x9.0) Super-4-Bay - Front View [One small square = 0.5 inch]
enlarge 81KB, 267x1024 5 mclapp's M4 (9.5x9.0) Super-4-Bay - Side View [One small square = 0.5 inch]
enlarge 91KB, 388x1024 6 mclapp's M4 (9.5x9.0) Super-4-Bay - Top View [One small square = 0.5 inch]
enlarge 125KB, 1024x648 7 mclapp's M4 (9.5x9.0) Super-4-Bay UHF Raw Gain is 8.5-12.2 dBi in New UHF Band and drops to about 6.2 dBi in Old Band.
enlarge 148KB, 1024x648 8 mclapp's M4 (9.5x9.0) Super-4-Bay UHF SWR(300-ohm). On lowest UHF channels SWR increases up to 4.0, which will reduce Net Gain.
