Hi-VHF+UHF Bowtie-In-Loop (BIL) Antenna analyzed using 4nec2. Loop Diameter = 23-in, Whiskers = 10-in. Based on a design (X0512 aka WW_X0498-Rev2,) by WildWillie on www.digitalhome.ca Antenna R&D Forum.
A simple to build antenna with moderate performance in BOTH UHF and Hi-VHF bands. Design dimensions based on using (about) 1/4-in O.D. Copper Coil. Design would need to be Re-Optimized for different O.D. so do NOT change to significantly different diameter.
UHF Raw Gain = 4.2-6.6 dBi with SWR (300-ohms) under 1.8 (Excellent). Hi-VHF Raw Gain more than 3.8 dBi with SWR (300-ohms) under 3.4 (Poor). Ch2-FM Raw Gain = 1.0 to 2.3 dBi and SWR (300-ohms) = 746 to 77, which is Excessive.
EDIT (25 Sept 2014): Added Ch2-FM Band Performance Charts.
Date(s): 20 Apr 2010. Album by holl_ands. 1 - 18 of 18 Total. 8156 Visits.
enlarge 86KB, 1024x1006 1 UHF+Hi-VHF Bowtie-In-Loop - NO Reflector 3D View Loop Diameter=23-inches, Whiskers=10-inches at 37-degrees.
enlarge 260KB, 1024x924 2 UHF+Hi-VHF Bowtie-In-Loop - NO Reflector Front View Loop Diameter=23-inches, Whiskers=10-inches at 37-degrees. [2 small box - 0.5 inches] "Holl_ands,
I think the scale shou..." "Antenna works very well. Built it f..." View Comments...