mclapp's 4-Bay Bowtie "9-5x9" (actually 9.5x9.0x8.5), with No Reflector, optimized for New UHF Band (Ch14-51): http://www.frontiernet.net/~mclapp/Antennas/Computer%20Models/ Filename run here is "4bay bow 9-5x9.nec"
UHF Raw Gain = 8.4 to 12.2 dBi and SWR (300-ohms) under 3.9. Hi-VHF Raw Gain = 3.7 and SWR (300-ohms) = 12 to 2.2. Higher SWR on Ch7-9 will degrade Net Gain and EVM, but may still be usable for strong stations.
Note that mclapp's posted 4nec2 file above has 8.5 rather than 9.0-in Inner-Outer Bowtie Separation shown here: http://www.frontiernet.net/~mclapp/Antennas/diagrams.html
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, Inner-Inner Bowtie Spacing = 9.0-in, Inner-Outer Bowtie Spacing = 8.5, Tine Separation = 5.5-in. Feedline Separation = 1.25-in, including at Crossover. Simulated Balun with 0.44-in SOURCE wire.
CONCLUSION: (9.5x9.0x8.5) has more Gain than M4 (9.5x9.0) on Ch52-69, but Hi-VHF SWR is worse.
EDIT (23Aug2009): Clarified difference between mclapp's 4nec2 file run here (9.5x9.0x8.5) versus his posted dimensions for a 9.5x9.0(x9.0) design.
Date(s): 27Feb2009. Album by holl_ands. 1 - 9 of 9 Total. 12863 Visits.
enlarge 21KB, 791x1024 1 4nec2 file for mclapp's 9_5x9 4-Bay with No Reflector
Download *.rtf file. Open and SAVEAS *.txt file. Then rename as *.nec file.
enlarge 0KB, 1024x819 2 9_5x9 4-Bay - UHF AGT
Average Gain Test
enlarge 0KB, 1024x819 3 9_5x9 4-Bay - Hi-VHF AGT
Average Gain Test
enlarge 0KB, 1024x819 4 9_5x9 4-Bay UHF Raw Gain = 8.4 to 12.2 dBi
