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 holl_ands | Home > Multi-Bay Bowtie Antennas > UHF 2-Bay Bowties - NO Reflectors > 
HiVHF+UHF 2-Bay WallTenna + Enhancements
Hi-VHF and UHF 2-Bay Bowtie (7.2x8.0-in) with No Reflector analyzed using 4nec2.
Dimensions came from Actual Measurements by user "freezer" on the WallTenna.
Yes, it's a 2-Bay Bowtie....but it's WAY TOO SMALL: http://www.walltenna.com

Three versions were analyzed: 1) As Built, 2) Add Whisker Extensions to improve UHF performance
and 3) Add Co-Planar Rectangular Loop Resonator to improve Hi-VHF Performance.

1) WallTenna As Built:

UHF Raw Gain = 3.5 to 7.9 dBi (Very Poor for 2-Bay, esp. lower Freqs) with SWR (300-ohms) under 2.3.
Hi-VHF Raw Gain = 2.0 to 2.2 dBi with SWR (300-ohms) = 28 to 15 [Excessive].

=====================================
2) Add Whisker Extensions to improve UHF performance:

UHF Raw Gain = 4.8 to 8.8 dBi (1.3 to 1.9 dB Improvement) with SWR (300-ohms) under 2.9.
Hi-VHF Raw Gain = 2.1 to 2.3 dBi with SWR (300-ohms) = 14 to 7.5 [Excessive].

=====================================
3) Add Co-Planar Rectangular Loop Resonator (23.5-in H x 24-in W) to improve Hi-VHF Performance.

UHF Raw Gain = 7.1 to 9.6 to 8.7 dBi (2.6 to 2.0 to 0.8 dB Improvement) with SWR (300-ohms)
Under 3.3 (a Bit Higher than "As Built").
Hi-VHF Raw Gain = 3.4 to 3.7 dBi (1.4 to 1.2 dB Better than "As Built") with SWR (300-ohms) under 2.9
(Huge Improvement).

ERRATA (18Jan2016): Scale label was incorrect in Slide #38.  Should be 2.5-in vice 1.25-in.
Date(s): 2 Feb 2015. Album by holl_ands. 1 - 58 of 58 Total. 3299 Visits.
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WallTenna 2-Bay Bowtie - As Built
3D View


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WallTenna 2-Bay Bowtie - As Built
Front View
[1 large square = 1.25 inches]


Enlarge Microsoft Word Document 3
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DOC3
WallTenna 2-Bay Bowtie - As Built
4nec2 File - Contains Dimensions Summary


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4
WallTenna 2-Bay Bowtie - As Built
UHF Raw Gain = 3.5 to 7.9 dBi
Very Poor for a 2-Bay, esp. lower Channels


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5
WallTenna 2-Bay Bowtie - As Built
UHF SWR (300-ohms) Under 2.3


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6
WallTenna 2-Bay Bowtie - As Built
UHF Impedance


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WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 470 MHz


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8
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 530 MHz


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9
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 590 MHz


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10
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 650 MHz


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11
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 698 MHz


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12
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 806 MHz


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13
WallTenna 2-Bay Bowtie - As Built
Hi-VHF Raw Gain = 2.0 to 2.2 dBi


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14
WallTenna 2-Bay Bowtie - As Built
Hi-VHF SWR (300-ohms) = 28 to 15 is Excessive


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15
WallTenna 2-Bay Bowtie - As Built
Hi-VHF Impedance


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16
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 174 MHz


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WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 198 MHz


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18
WallTenna 2-Bay Bowtie - As Built
Azimuthal Pattern at 216 MHz


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19
WallTenna 2-Bay + Whisker Extensions
3D View


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20
WallTenna 2-Bay + Whisker Extensions
Front View
[1 large square = 1.25 inches]


Enlarge Microsoft Word Document 21
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DOC21
WallTenna 2-Bay + Whisker Extensions
4nec2 File Contains DimensionsSummary


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22
WallTenna 2-Bay + Whisker Extensions
UHF Raw Gain = 4.8 to 8.8 dBi


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23
WallTenna 2-Bay + Whisker Extensions
UHF SWR (300-ohms) Under 2.9


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24
WallTenna 2-Bay + Whisker Extensions
UHF Impedance


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25
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 470 MHz


Enlarge photo 26
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26
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 530 MHz


Enlarge photo 27
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27
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 590 MHz


Enlarge photo 28
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28
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 650 MHz


Enlarge photo 29
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29
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 698 MHz


Enlarge photo 30
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30
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 806 MHz


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WallTenna 2-Bay + Whisker Extensions
Hi-VHF Raw Gain = 2.1 to 2.3 dBi


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32
WallTenna 2-Bay + Whisker Extensions
Hi-VHF SWR (300-ohms) = 14 to 7.5 is Excessive


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33
WallTenna 2-Bay + Whisker Extensions
Hi-VHF Impedance


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34
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 174 MHz


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35
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 198 MHz


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36
WallTenna 2-Bay + Whisker Extensions
Azimuthal Pattern at 216 MHz


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37
WallTenna + Extensions + Rectangular Loop
3D View


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38
WallTenna + Extensions + Rectangular Loop
Front View
[1 large square = 2.5 inches]

[Correction: Was 1.25 inches]


Enlarge Microsoft Word Document 39
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DOC39
WallTenna + Extensions + Rectangular Loop
4nec2 File Contains Dimensions Summary


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40
WallTenna + Extensions + Rectangular Loop
UHF Raw Gain = 7.1 to 9.6 to 8.7 dBi


Enlarge photo 41
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41
WallTenna + Extensions + Rectangular Loop
UHF SWR (300-ohms) Under 3.3
is a Bit Higher than "As Built"


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42
WallTenna + Extensions + Rectangular Loop
UHF Impedance


Enlarge photo 43
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43
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 470 MHz


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WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 530 MHz


Enlarge photo 45
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45
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 590 MHz


Enlarge photo 46
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46
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 650 MHz


Enlarge photo 47
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47
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 698 MHz


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48
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 806 MHz


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49
WallTenna + Extensions + Rectangular Loop
Hi-VHF Raw Gain = 3.4 to 3.7 dBi is
1.4 to 1.2 dB Better than "As Built"


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50
WallTenna + Extensions + Rectangular Loop
Hi-VHF SWR (300-ohms) Under 2.9


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51
WallTenna + Extensions + Rectangular Loop
Hi-VHF Impedance


Enlarge photo 52
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52
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 174 MHz


Enlarge photo 53
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53
WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 198 MHz


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WallTenna + Extensions + Rectangular Loop
Azimuthal Pattern at 216 MHz


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WallTenna vs M2 & H2
UHF Raw Gain


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WallTenna vs M2 & H2
UHF Net Gain


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WallTenna vs M2 & H2
Hi-VHF Raw Gain


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WallTenna vs M2 & H2
Hi-VHF Net Gain
Showing Result of SWR Improvement


 
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