Amateur Radio Antenna And Feed Line Specifications

This page is dedicated to length specifications for dipoles, folded dipoles, inverted V's, verticals, ground planes, quad loops, delta loops and extended double zepps.  You will also find feed line lengths to SWR match the band.

Choose from the list below or browse the whole page:

1/2 And 1/4 Wave
1/4, 5/8 and 3/4 Wave Vertical
1/2 Wave Dipole, Beam, Inverted V, Collinear Array and Extended Double Zepp
Full Wave Quad and Delta Loops

1/2 And 1/4 Wave

BAND AND MODE	Center Frequency (MHz)	1/2wave in space (ft)	Feed (Coax/Balanced) (ft)	1/4wave in space (ft)	Feed (Coax/Balanced) (ft)
6 Meters CW/SSB	50.100	9.82	6.68/8.05	4.91	3.34/4.03
6 Meters FM	52.525	9.37	6.37/7.68	4.68	3.18 /3.84
10 Meters CW	28.050	17.54	11.75/15.44	8.77	5.88/7.72
10 Meters SSB	28.450	17.29	11.59/15.22	8.65	5.79/7.61
10 Meters FM	29.600	16.62	11.14/14.63	8.31	5.57/7.31
12 Meters All Modes	24.920	19.74	13.43/16.19	9.87	6.71/8.09
15 Meters CW	21.060	23.36	15.65/20.56	11.68	7.83/10.28
15 Meters SSB	21.300	23.10	15.48/20.33	11.55	7.74/10.16
17 Meters All Modes	18.110	27.17	18.47/22.28	13.58	9.24/11.14
20 Meters CW	14.060	34.99	23.45/30.79	17.50	11.72/15.4
20 Meters SSB	14.220	34.60	23.18/30.45	17.30	11.59/15.22
30 Meters CW	10.120	48.62	33.06/39.87	24.31	16.53/19.93
40 Meters CW	7.025	70.04	47.62/57.43	35.02	23.81/28.71
40 Meters SSB	7.225	68.10	46.31/55.84	34.05	23.15/27.92
80 Meters CW	3.600	136.67	91.57/120.27	68.33	45.78/60.13
75 Meters SSB	3.875	126.97	85.07/111.73	63.48	42.53/55.87
160 Meters	1.840	267.39	181.83/219.26	133.70	90.91/109.63

1/4, 5/8 and 3/4 Wave Vertical

BAND AND MODE	1/4wave Vertical (ft)	1/4wave Groundplane Radials (ft)	5/8wave Vertical (ft)	5/8wave Groundplane Radials (ft)	3/4 wave Vertical (ft)	1/8wave Groundplane (ft)
6 Meters CW/SSB	4.67	5.50	12.04	4.67	14.49	2.34
6 Meters FM	4.46	5.25	11.48	4.46	13.82	2.23
10 Meters CW	8.34	9.82	21.75	8.34	25.88	4.17
10 Meters SSB	8.22	9.68	21.44	8.22	25.52	4.11
10 Meters FM	7.91	9.31	20.61	7.91	24.53	3.95
12 Meters All Modes	9.39	11.06	21.20	9.39	29.13	4.70
15 Meters CW	11.11	13.08	28.97	11.11	34.47	5.56
15 Meters SSB	10.99	12.94	28.64	10.99	34.08	5.49
17 Meters All Modes	12.92	15.21	33.30	12.92	40.09	6.46
20 Meters CW	16.64	19.60	43.39	16.64	51.64	8.32
20 Meters SSB	16.46	19.38	42.90	16.46	51.05	8.23
30 Meters CW	23.12	27.23	59.58	23.12	71.74	11.56
40 Meters CW	33.31	39.22	85.84	33.31	103.35	16.65
40 Meters SSB	32.39	38.13	83.46	32.39	100.48	16.19
80 Meters CW	65.00	76.53	169.47	65.00	201.67	32.50
75 Meters SSB	60.39	71.10	157.44	60.39	187.35	30.19
160 Meters	127.17	149.74	327.72	127.17	394.57	63.59

1/2 Wave Dipole, Beam, Inverted V, Collinear Array and Extended Double Zepp

BAND AND MODE	1/2wave Dipole/Vertical (ft)	1/2wave Reflector (ft)	1/2wave Director (ft)	1/2wave Folded Dipole (ft)	1/2wave Inverted V (ft)	Collinear Array (ft)	Extended Double Zepp (ft)
6 Meters CW/SSB	9.34	9.81	8.92	9.22	9.68	19.16	24.07
6 Meters FM	8.91	9.36	8.51	8.80	9.23	18.28	22.96
10 Meters CW	17.52	17.52	15.93	16.47	17.29		44.90
10 Meters SSB	16.45	17.27	15.71	16.24	17.05		44.27
10 Meters FM	15.81	16.60	15.47	15.61	16.39		42.55
12 Meters All Modes	18.78	19.72	17.93	18.54	19.46	38.52	48.39
15 Meters CW	22.22	23.33	21.22	21.94	23.03		59.81
15 Meters SSB	21.97	23.07	20.98	21.69	22.77		59.13
17 Meters All Modes	25.84	27.13	24.68	25.51	26.78	53.01	66.59
20 Meters CW	33.29	34.95	31.79	32.86	34.50		89.58
20 Meters SSB	32.91	34.56	31.43	32.49	34.11		88.57
30 Meters CW	46.25	48.56	44.16	45.65	47.92	94.86	119.17
40 Meters CW	66.62	69.95	63.62	65.77	69.04	136.65	171.67
40 Meters SSB	64.78	68.01	61.86	63.94	67.13	132.87	166.92
80 Meters CW	130.00	65.00	136.50	128.33	134.72		349.87
75 Meters SSB	120.77	126.81	115.34	119.23	125.16		325.04
160 Meters	254.35	267.07	242.90	251.09	263.59	521.74	655.43

Full Wave Quad and Delta Loops

BAND AND MODE	Fullwave Quad Loop (ft)	Fullwave Quad Loop Reflector (ft)	Fullwave Quad Loop Director (ft)	Fullwave Delta Loop (ft)	Fullwave Delta Loop Reflector (ft)	Fullwave Delta Loop Director (ft)
6 Meters CW/SSB	20.36	21.38	19.44	20.36	21.38	19.44
6 Meters FM	19.42	20.39	18.55	19.42	20.39	18.55
10 Meters CW	36.36	38.18	34.73	36.36	38.18	34.73
10 Meters SSB	35.85	37.64	34.24	35.85	37.64	34.24
10 Meters FM	34.46	36.18	32.91	34.46	36.18	32.91
12 Meters All Modes	10.93	42.98	39.09	40.93	42.98	39.09
15 Meters CW	48.43	50.85	46.25	48.43	50.85	46.25
15 Meters SSB	47.89	50.28	45.73	47.89	50.28	45.73
17 Meters All Modes	56.32	59.14	53.79	56.32	59.14	53.79
20 Meters CW	72.55	76.17	69.28	72.55	76.17	69.28
20 Meters SSB	71.73	75.32	68.50	71.73	75.32	68.50
30 Meters CW	100.79	105.83	96.25	100.79	105.83	96.25
40 Meters CW	145.20	152.46	138.66	145.20	152.46	138.66
40 Meters SSB	141.18	148.24	134.82	141.18	148.24	134.82
80 Meters CW	283.33	297.50	270.58	283.33	297.50	270.58
75 Meters SSB	263.23	276.39	251.38	263.23	276.39	251.38
160 Meters	554.35	582.07	529.40	554.35	582.07	529.40