Jul 05, 2007, 07:30 AM Chuck 'Em and Chase 'Em United States, NY, Plainview Joined Aug 2005 8,120 Posts Discussion 1/4 wavelength calculation and antenna length Guys, I was looking to determine what length my broken antenna should be (since I did not measure it before hand and the manufacturer has given me a range of lengths to work with). I noticed that somewhere it was said the the median 1/4 wavelength is 39.75 inches which should be for about channel 36 plus or minus. When I did the following calculation (knowing that speed of light = wavelength x freq -> c/freq = wavelength) I did the following : 299,792,458 metres per second /freq(Hz) = meters * (100cm/ 1m) *(1in/ 2.54cm) to get the wavelength in inches * 1/4 = 1/4 wavelength in inches ex ch 30 = 72.390 mHz = 72,390,000Hz 299792458 / 72,390,000 *100 /2.54 * 1/4 ~ 40.76 inches channel 36 should be about 40.69 inches why is this wavelength LONGER than what it is stated to be for the median 1/4 wavelength? Based on this equation, ch 55 is ~ 40.48 inches Can anyone tell me where I went wrong??? Thanks Frank Last edited by Fly2High; Jul 05, 2007 at 07:43 AM.