EFLW51

Flattop @ 10M height

• The 51m wire is a good choice for 160m–30m, where the electrical length and radiation patterns remain manageable.
• For 20m and higher, its excessive length creates a fragmented pattern, making it unsuitable for effective DX. 

Band	Height Relative to λ	Low-Angle Radiation (<15°)	DX Suitability	NVIS Capabilities
160m	0.29 λ	Weak	Poor	Excellent
80m	0.68 λ	Moderate	Moderate*	Strong
60m	0.9 λ	Moderate	Good*	Moderate
40m	1.2 λ	Strong	Excellent	Weak
30m	1.7 λ	Strong	Moderate	N/A
20m	2.4 λ	Compromised	Compromised	N/A
17m	2.9 λ	Compromised	Compromised	N/A
15m	3.1 λ	Compromised	Compromised	N/A
12m	4.2 λ	Compromised	Compromised	N/A
10m	5.1 λ	Compromised	Compromised	N/A

* If your goal is to improve DX performance on 80m, 60m raise the antenna to a height of at least 18M above the ground.

EFLW37

Flattop @ 10M height

Low Bands (160m–40m):

• 160m: Poor DX efficiency but excellent for NVIS.
• 80m and 60m: Moderate efficiency with balanced DX and NVIS capabilities.
• 40m: Efficiency improves significantly, with good DX performance and weak NVIS.

Mid Bands (30m and 20m):

• Excellent efficiency and strong DX performance dominate.

High Bands (17m–10m):

• Efficiency remains high, but multiple lobes reduce focused DX capability, especially on 12m and 10m.

Band	Height Relative to λ	Low-Angle Radiation (<15°)	DX Suitability	NVIS Suitability
160m	0.22 λ	Weak	Poor	Excellent
80m	0.46 λ	Weak	Moderate	Strong
60m	0.65 λ	Moderate	Moderate to Good	Moderate
40m	0.88 λ	Moderate	Good	Weak
30m	1.2 λ	Strong	Excellent	N/A
20m	1.7 λ	Strong	Excellent	N/A
17m	2.1 λ	Compromised	Compromised	N/A
15m	2.6 λ	Compromised	Compromised	N/A
12m	3.2 λ	Compromised	Compromised	N/A
10m	3.7 λ	Compromised	Compromised	N/A

 

EFLW22

Flattop @ 10M height

Low Bands (80m–40m):

• 80m: Poor DX efficiency but excellent for NVIS.
• 60m: Moderate efficiency with balanced DX and NVIS capabilities.
• 40m: Efficiency improves significantly, with Moderate DX performance and Moderate NVIS.

Mid Bands (30m and 20m):

• Excellent efficiency and strong DX performance dominate.

High Bands (17m–10m):

• Excellent efficiency and strong DX performance dominate.

Band	Height Relative to λ	Low-Angle Radiation (<15°)	DX Suitability	NVIS Suitability
80m	0.27 λ	Weak	Poor	Excellent
60m	0.39 λ	Weak	Moderate	Strong
40m	0.58 λ	Moderate	Moderate	Moderate
30m	0.73 λ	Moderate	Good	N/A
20m	1.0 λ	Strong	Excellent	N/A
17m	1.3 λ	Strong	Excellent	N/A
15m	1.7 λ	Strong	Excellent	N/A
12m	2.1 λ	Strong	Excellent	N/A
10m	2.6 λ	Moderate	Good	N/A