Hi-VHF+UHF 4-Bay Bowtie (mclapp M4 with 9.5x9.0-in sizing, ALL AWG10) Inside a 36-in H x 24-in W Rectangular Loop (0.5-in equiv. O.D. assumed) analyzed using 4nec2.
UHF Raw Gain = 8.1 to 12.2 dBi and SWR (300-ohms) under 3.8 [FAIR]. Hi-VHF Raw Gain = 4.3 to 4.7 dBi and SWR (300-ohms) under 4.0 [FAIR]. For Assumed ALL AWG10 Wire Size. Larger AWG8 (i.e. three AWG12 wires twisted together) or 3/4-in Aluminized Mylar Tape would have significantly lower SWR.
Compare to M4 (9.5x9) Super-4-Bay (NO Reflector): UHF Raw Gain is 8.5-12.2 dBi and SWR under 4.0 [ FAIR]. Hi-VHF Raw Gain is 3.5 dBi and SWR under 2.7 [EXCELLENT]. See mclapp's posted drawings, as optimized for New UHF Band (Ch14-51), using 1/8-in = AWG8 elements and AWG12 feedlines [Element Radius is NOT Critical]: http://m4antenna.eastmasonvilleweather.com/index.html Website re DIY Construction: https://sites.google.com/site/maycreates/ota-setup/mclapp-4
The Outer Rectangular Loop acted as a RESONATOR, actually improving Hi-VHF Raw Gain about 1 dB. Hi-VHF SWR was degraded from 2.7 (max) to 4.0, which is a bit high. UHF was only degraded 0.5 dB on the lowest channels and SWR was just a bit higher.
Since wall mounting a Picture might not put the Max Gain toward desired stations, Raw Gain Charts have also been provided at various angles offset from straight forward, bearing in mind that signals might be strong enough to overcome significant off-beam attenuation.
Date(s): 16 Nov 2013. Album by holl_ands. 1 - 36 of 36 Total. 2690 Visits.
enlarge 98KB, 711x1024 1 M4 (9.5x9) Bowtie-In-RectLoop 3D View
enlarge 244KB, 682x1024 2 M4 (9.5x9) Bowtie-In-RectLoop Front View [1 large square = 2.5 inches]
