K5GO Alternate 40 meter half-elements for 22nd Edition of ARRL Antenna Book
Chapter 25, Figures 25.10 and 25.10

Wind/ice survivability ratings in mph:

Half-Element 1 - rated for 77 MPH with no ice

Half-Element 2 - rated for 82 MPH with no ice

These elements are intended to be used in areas not subject to high winds and that receive little or no ice. Ice-phobic paint is available from Wearlon Industries (www.wearlon.com). 
 
All tubing with 0.116" wall thickness consists of concentric 0.058" wall sections of the same length.  i.e. - a 0.750" OD segment with 0.116" wall thickness is constructed from 0.750" OD tubing of 0.058" wall thickness with the same length of 0.625" OD tubing with 0.058" wall thickness inside it.

Tubing with 0.125" or 0.250" wall thickness is T6061-6 alloy.  All other tubing is 6063-T832.

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The half-elements are defined as follows:

Band and Light Duty/Heavy Duty (LD/HD)
Total half-element length (inches)
Center to Tip order
Section label
Total length of tubing section (inches)
OD of tubing (inches)
Tubing wall thickness (inches)

Notations:
  EX - Total exposed length
  OL - Overlap with next larger section
  DB - Doubler: tubing section completely inside and flush with the inner end of next larger section
  Reducing sleeves are constructed from short sections of concentric tubing

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Half-element 1
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Total half-element length: 144+66+68+68+20+20+20+32 = 438
Center							Tip
Sect 8	Sect 7	Sect 6	Sect 5	Sect 4	Sect 3	Sect 2	Sect 1
144	72	72	72	24	24	24	24	36
2.000	1.500	1.250	1.000	0.750	0.625	0.500	0.375
0.125	0.116	0.058 	0.058	0.058	0.058	0.058	0.058
144 EX
	6" reducing sleeve required; use 1.75" and 1.625" 0.058" wall tubing
	6 OL
	66 EX
	Note 1
		4" reducing sleeve required; use 1.375" tubing
		4 OL
		68 EX
			4" reducing sleeve required; use 1.125" tubing
			4 OL
			68 EX
				4" reducing sleeve required; use 0.875" tubing
				4 OL
				20 EX
					4 OL
					20 EX
						4 OL
						20 EX
							4 OL
							32 EX
			


Note 1 - Section 7 consists of a 6' length of 1.500" tubing with a 6' length of 1.375" tubing inside it.

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Half-element 2
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40LD:
Total half-element length: 144+66+68+68+20+20+20+32 = 438
Center									Tip
Sect 10	Sect 9	Sect 8	Sect 7	Sect 6	Sect 5	Sect 4	Sect 3	Sect 2	Sect 1
144	72	36	72	36	72	24	24	24	36
2.000	1.500	1.250	1.250	1.000	1.000	0.750	0.625	0.500	0.375
0.125	0.116	0.058	0.116	0.058	0.116	0.058	0.058	0.058	0.058
144 EX
	6" reducing sleeve required; use 1.75" and 1.625" 0.058" wall tubing
	6 OL
	66 EX
	Note 2
		36 DB
		Note 2
			4 OL
			68 EX
			Note 3
				36 DB				
				Note 3
					4 OL
					68 EX
						4 OL
						20 EX
							4 OL
							20 EX
								4 OL
								20 EX
									4 OL
									32 EX

Note 2 - Section 9 consists of a 6' length of 1.500" tubing with a 6' length of 1.375" tubing inside it. Section 8 is a  
3' length of 1.250" tubing inside Section 9.
Note 3 - Section 7 consists of a 6' length of 1.250" tubing with a 6' length of 1.125" tubing inside it. Section 6 is a  
3' length of 1.250" tubing inside Section 7.