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Hi-VHF+UHF Bowtie-In-Loop - NO Reflector
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. 10057 Visits.
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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
3D View
Loop Diameter=23-inches,
Whiskers=10-inches at 37-degrees.

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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..."
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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
4nec2 File

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
UHF Raw Gain = 4.2-6.6 dBi

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
UHF SWR (300-ohms) under 1.8

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
UHF Impedance

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
UHF Pattern at 470 MHz

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
UHF Pattern at 602 MHz

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
UHF Pattern at 698 MHz

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Hi-VHF Raw Gain more than 3.8 dBi

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Hi-VHF SWR (300-ohms) under 3.4

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Hi-VHF Impedance

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Hi-VHF Pattern at 174 MHz

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Hi-VHF Pattern at 198 MHz

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Hi-VHF Pattern at 216 MHz

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Ch2-FM Raw Gain = 1.0 to 2.3 dBi

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Ch2-FM SWR = 746 to 77 is EXCESSIVE

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UHF+Hi-VHF Bowtie-In-Loop - NO Reflector
Ch2-FM Impedance

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Nice Details.
Best happy birthday funny.
 - Chi Ho, Sat, 18 Mar 2023 9:43AM