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Detailed analysis of Helical Antennas , aperture antennas, and the famous W8JK array.

John D. Kraus, Ronald J. Marhefka, Ahmad S. Khan. Tata McGraw Hill, 2006 - Antennas (Electronics) - 906 pages. Google Books Antennas And Wave Propagation (Sie) 4E [4 

Antennas and Wave Propagation: Fourth Edition - Google Books