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Extra info for Antennas & Projects
8 gives specifications for the dual-band vertical. If your existing 40-m vertical is a few inches longer than 32 ft, 3 inches, try using it anyway—a few inches isn’t too critical to performance on 17 m. 47—Dual-band vertical. Use a switch or relay to remove the loading coil from the circuit for lower frequency operation. Adjust the coil tap for best SWR on the higher-frequency band. The radial system should be as extensive as possible. See The ARRL Antenna Book for more information on ground systems for vertical antennas.
L is added to provide an electrical quarter wavelength overall. 50—Some variations in vertical antennas. D is the vertical radiation pattern in the plane of a half sloper, with the sloper to the right. E is the azimuthal pattern of the half sloper (90° azimuth is the direction of the sloping wire). Both patterns apply to 160- and 80-m antennas described in the text. 44 Chapter 20 THE HALF-SLOPER ANTENNA Many hams have had excellent results with half-sloper antennas, while others have not had such luck.
60—Elevation-plane response of a 3-element Yagi placed 1/2 λ above perfect ground at (A) and the same antenna spaced 1 λ above ground at (B). 61—Azimuth-plane pattern of a typical three-element Yagi in free space. The Yagi’s boom is along the 0° to 180° axis. the spacing and tuning of the elements. Element tuning is a function of length, diameter and taper schedule if the element is constructed with telescoping tubing. For any given spacing, there is a tuning condition that will give maximum gain at this spacing.