mclapp's M4 (10"x9.5") Super-4-Bay Bowtie with 2-in Swept Forward Bowties and Double Angled Reflector analyzed using 4nec2. Same Reflector as for M4 (9.5"x9"). Dimensions found here: http://m4antenna.eastmasonvilleweather.com/index.html Performance in New UHF Band, esp. lower channels, is slightly better than M4 (9.5"x9"). Website re DIY Construction: https://sites.google.com/site/maycreates/ota-setup/mclapp-4
UHF Raw Gain = 13.8 to 15.8 to 15.0 dBi, F/B & F/R Min = 18.2 dB and SWR (300-ohms) under 2.2. Hi-VHF Raw Gain = 9.5 to 9.0 dBi, F/B & F/R Ratio = 12 to 19 dB [FAIR-GOOD] and SWR (300-ohms) = 6 to 16 [EXCESSIVE].
AWG8 BowLength = 10.0-in, Bowtie Spacing = 9.5-in, Bowtie Forward Sweep= 2.0, Tine Separation = 5.5-in. AWG12 Feedline Separation = 1.25-in, with 1.0-in at Crossover. Center of Crossover 3.125-in from Center of Outer Bowties.
Double Angled Screen Reflector, 16-Gauge, 40"Hx36"W, with outer 10-in bent forward 2.5-in, Grid = 1"H x 2"W. Separation of Reflector from Bowties=4.5-in (at centerline).
Gain and SWR are Good for entire New UHF Band, with only moderate reduction for Old Band (Ch52-69). Hi-VHF Ch7-13 has only moderate Net Gain loss due to increasing SWR on Ch9-13.
Date(s): 16 Oct 2011. Album by holl_ands. 1 - 19 of 19 Total. 8657 Visits.
enlarge 259KB, 792x1024 1 M4 (10"x9.5") Super-4-Bay Bowtie 3D View
enlarge 349KB, 936x1024 2 M4 (10"x9.5") Super-4-Bay Bowtie Front View [1 large box = 5.0-inches]
enlarge 106KB, 331x1024 3 M4 (10"x9.5") Super-4-Bay Bowtie Side View [1 large box = 5.0-inches]
enlarge 151KB, 1152x584 4 M4 (10"x9.5") Super-4-Bay Bowtie UHF Raw Gain = 13.8 to 15.8 to 15.0 dBi UHF F/B & F/R Min = 18.2 dB
