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Those lengths are approximate like I said. One you start operating a single length on multiple bands thins change somewhat. The reason is that the desired parts of the various bands my not be a perfect harmonic multiple of the other. Example: cut an antenna for 3800 and it will be resonant at 7600 which is outside the 40m band and at 15200 which is nowhere near the 20m band. Also the end effect of an antenna is taken into account only once even if the antenna is 3 or 4 1/4 wavelengths long. The longer the antenna is in terms of wavelengths the greater this error in overall length becomes.

[QUOTE="Captain Kilowatt, post: 517623, member: 39"] Those lengths are approximate like I said. One you start operating a single length on multiple bands thins change somewhat. The reason is that the desired parts of the various bands my not be a perfect harmonic multiple of the other. Example: cut an antenna for 3800 and it will be resonant at 7600 which is outside the 40m band and at 15200 which is nowhere near the 20m band. Also the end effect of an antenna is taken into account only once even if the antenna is 3 or 4 1/4 wavelengths long. The longer the antenna is in terms of wavelengths the greater this error in overall length becomes. [/QUOTE]

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