Richard Harrison wrote:

Ian Jackson wrote:
"Maybe 377 ohms?"

Arnold B. Bailey in "TV and Other Receiving Antennas" shows his
calculations of radiation resistance at the current maximum point for a
center-fed thin dipole at its various resonances:

1st--------------------------------72 ohms
2nd------------------------------200 ohms
3rd-------------------------------102 ohms
4th-------------------------------260 ohms
5th-------------------------------117 ohms
6th-------------------------------295 ohms
7th-------------------------------127 ohms
8th-------------------------------321 ohms
9th-------------------------------135 ohms
10th-----------------------------340 ohms

Note that those are not the feedpoint impedances. They are
based on the current maximum points which often occur
somewhere besides the feedpoint.
--
73, Cecil http://www.qsl.net/w5dxp


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