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Yagi Comparison Charts
Comparison Charts for Yagi Antennas.
Date(s): 17 Jul 2013. Album by holl_ands. 1 - 13 of 13 Total. 8439 Visits.
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Hi-VHF 4-El K7MEM Folded Dipole Yagi vs
"Stick Dipole" Yagi: Essentially no difference.

Although Raw Gain covers Ch7-10, Net Gain is best
only over Ch8-9.  Rapidly falling Net Gain across
Ch10 can cause reception problems.

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Compare 5-El K6STI Yagi RevA to 4-El K7MEM Yagis

K7MEM (DL6WU equations) provides higher gain
but only for two adjacent channels.

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Net Gain Comparison:
8-El K7MEM Yagis (Ch8-10 and Ch11-13)
14-El ZS6BTE LPDA (Log Periodic Dipole Array)
14-El Wedge Zig-Zag LPA (Log Periodic Array)
14-El Stacked Zig-Zag LPA (Log Periodic Array)
5-El K6STI Yagi RevA

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Hi-VHF 5-El K6STI Yagi - Compare Raw & Net Gains

Top: Folded Dipole (300-ohm) variant.
Middle: RevA K6STI design.
Bottom: Original K6STI design.

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Hi-VHF 5-El K6STI Yagi - Compare SWR

Note K6STI's calculated SWR was lower than 4nec2,
but still showed increase on Ch13

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Hi-VHF 5-El K6STI Yagi - Compare F/R and F/B Ratios
Excellent suppression of signals coming from the rear.

"Rear" is very narrow angle towards the rear.
"Back" includes response +/- 45-deg from "Rear".

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F/R and F/B Ratio Comparison:
14-El ZS6BTE LPDA (Log Periodic Dipole Array)
5-El K6STI Yagi RevA
8-El K7MEM Yagis (Ch8-10 and Ch11-13)

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Hi-VHF 8-Element Yagi Antennas: Raw & Net Gain
Yagi only covers three adjacent channels.

Optimized for Ch8-10 (190 MHz Design Freq) and
Ch11-13 (208 MHz Design Freq).

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Hi-VHF 8-El. Yagis vs 14-El. LPDA: Gain & F/R Ratio
Both are approx. 100-inches long.

LPDA has 2 dB lower Gain, but covers entire band with
much higher Front-To-Rear (F/R) Ratio.

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Raw Gain and Net Gain for:
Antennas Direct 91XG 21-Element Corner Yagi
18-Element Yagi with 1 Very Long Reflector Rod
18-Element Yagi with 9 Stacked Reflector Rods

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F/B and F/R Ratios for:
Antennas Direct 91XG 21-Element Corner Yagi
18-Element Yagi with 1 Very Long Reflector Rod
18-Element Yagi with 9 Stacked Reflector Rods

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A-D 91XG Yagi with Corner Reflector
Raw vs Net Gain and SWR(300-ohm)

Gain increases with frequency.
Load matching Balun could improve Net Gain.

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A-D 91XG Yagi with Corner Reflector
Raw vs Net Gain vs F/B vs F/R Ratios

Extremely effective suppressing signals from Rear.

 
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