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Im Dave Kessler ke 0og your guide through the ARRL extra class license manual for ham radio our topic for today is section 9.1 basics of antennas this section which builds on section 6.1 of the general class license manual provides quite a number of definitions that allow us to compare one antenna type with another well talk about antenna radiation patterns gain beam width radiation resistance feed point impedance efficiency polarization and bandwidth thats quite a bit of stuff with these video introductions Ill try to provide background and a brief sketch of each subject to help you understand the material in the text the first topic well discuss is antenna radiation patterns lets spend some extra time with figure 9 - 1b which shows the radiation pattern for a simple idealized dipole this is whats called the azimuthal pattern and the numbers along the outside edge of the circle represent degrees of azimuth with north at the top in the diagram you are way up in the sky looking d