This handy chart was developed by Gary, ZL2IFB. It is a very simple way of finding out what length of wire you need for your particular frequency. Thanks Gary!

Band	CW	SSB	¼ wave	¼ – 5%	¼ x 0.66	½ wave	½ – 5%	½ x 0.66	Full wave	F – 5%	F + 10%	F x 0.66
160m	1.825		41.07	39.01	27.38	82.13	78.03	54.76	164.27	156.06	180.70	109.51
		1.850	40.51	38.49	27.01	81.02	76.97	54.02	162.05	153.95	178.25	108.03
80m	3.520		21.29	20.23	14.19	42.58	40.45	28.39	85.17	80.91	93.69	56.78
		3.800	19.72	18.74	13.15	39.45	37.47	26.30	78.89	74.95	86.78	52.60
40m	7.025		10.67	10.14	7.11	21.34	20.27	14.23	42.68	40.54	46.94	28.45
		7.100	10.56	10.03	7.04	21.11	20.06	14.07	42.22	40.11	46.45	28.15
30m	10.105		7.42	7.05	4.94	14.83	14.09	9.89	29.67	28.18	32.63	19.78
20m	14.020		5.35	5.08	3.56	10.69	10.16	7.13	21.38	20.31	23.52	14.26
		14.250	5.26	5.00	3.51	10.52	9.99	7.01	21.04	19.99	23.14	14.03
17m	18.075		4.15	3.94	2.76	8.29	7.88	5.53	16.59	15.76	18.24	11.06
		18.120	4.14	3.93	2.76	8.27	7.86	5.51	16.54	15.72	18.20	11.03
15m	21.020		3.57	3.39	2.38	7.13	6.77	4.75	14.26	13.55	15.69	9.51
		21.250	3.53	3.35	2.35	7.05	6.70	4.70	14.11	13.40	15.52	9.41
12m	24.900		3.01	2.86	2.01	6.02	5.72	4.01	12.04	11.44	13.24	8.03
		24.950	3.00	2.85	2.00	6.01	5.71	4.01	12.02	11.41	13.22	8.01
10m	28.025		2.67	2.54	1.78	5.35	5.08	3.57	10.70	10.16	11.77	7.13
		28.500	2.63	2.50	1.75	5.26	5.00	3.51	10.52	9.99	11.57	7.01
6m	50.100		1.50	1.42	1.00	2.99	2.84	1.99	5.98	5.68	6.58	3.99
		52.050	1.44	1.37	0.96	2.88	2.74	1.92	5.76	5.47	6.34	3.84

Where a full wave in metres = frequency in Hz divided by the speed of light (299,792,458 m/s)

Reduce dipoles by ~5% for end effects. Add 5-10% to full wave loops. Trim all antennas to resonance.

Lose one third physical length for velocity factor of typical coax. 73 de ZL2iFB