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ARRL Antenna Book Reference

24th Edition - Support

  • Overview and Directions

    This web page is for information that extends or supports the ARRL Antenna Book, 24th edition.  The section for each edition contains links to supplemental files and software, non-ARRL documents, and errata and corrections. 


    Supplemental information is available as a downloadable package beginning with this edition.  You will find an access code on a sheet inside the front cover with complete instructions.  Once installed, use Adobe Reader to access the PDF files.  

    Some readers report that the version Adobe Reader Touch, provided with Microsoft Apps, does not support all of the PDF features.  If this is a problem, download the free Adobe Reader DC from the Adobe website at which does support the necessary elements, such as bookmarks.  Note that the website for downloads will also download a Google Chrome extension and two McAfee security applications unless you opt out by unchecking the necessary boxes.


    Printed-circuit boards for many current and previous Antenna Book projects are available from FAR Circuits.



    Information in support of previous editions can be found on the ARRL Antenna Book - 23rd Edition or ARRL Product Notes page for editions before the 22nd.

  • Software

    The following PDF instruction files are provided here as a convenience to users of the software provided in the Antenna Book downloadable supplemental information.

    HFTA - Instructions
    YW - Instructions
    TLW - Instructions


    EZNEC - previous editions of the Antenna Book included a version of EZNEC-ARRLwhich ran special model files. This software has been replaced by the demo version of EZNEC 6.0 which available online from the EZNEC website.  The demo version of EZNEC will run the EZNEC-ARRL models without modification.



    The following list includes Windows-based software utilities that support various topics in the Antenna Book. Chapter numbers refer to the primary chapter in the ARRL Antenna Book that references the software.  No additional documentation is available beyond what, if any, is provided with the software. 


    Unless otherwise noted, all of the software listed here can be downloaded to your hard drive, unzipped if necessary, and run directly from the Windows Start menu without requiring installation in the Windows system.


    Chapter 1 - Antenna Fundamentals

        SCALE.ZIP - a software utility to change the frequency of YW antenna models while compensating for element diameters and taper.  Models from other software can be used as described in the documentation included with the utility.


    Chapter 4 - Radio Wave Propagation

        RngBrg.ZIP - software to compute the range and bearing from a point at one latitude/longitude to another.


    Chapter 7 - Log Periodic Antennas

        Log Periodic Element and Phase Line Calculator - Spreadsheet to calculate LPDA element lengths and spacings, along with phase line impedance, by Dennis Miller, KM9O.  This spreadsheet is in Excel format (XLS) and was last updated on 12 Sep 2011.


    Chapter 8 - Multielement Arrays

        SCALE.ZIP - see Chapter 1 above. - software to design feed systems for phased array using transmission lines.


    Chapter 11 - HF Yagi and Quad Antennas

        GAMMAMW4.ZIP - An improved version of the previous utility GAMM2-1 that corrects a calculation problem that fails to find solutions to the calculations when the combination of the desired feed line impedance exceeds the product of the raw antenna resistance and the gamma step-up value.  The code was developed by Bill Wortman, N6MW and generously donated to the ARRL and the readers of the Antenna Book, ARRL Handbook, and Low-Band DXing by ON4UN.  The ARRL also wishes to thank Greg Ordy, W8WWV for testing the code.

        EFFLEN.ZIP - A software routine (written in FORTRAN) to calculate effective lengths of antenna elements.


    Chapter 21 - Mobile and Maritime HF Antennas

        MOBILE.ZIP - Mobile whip design software by Leon Braskamp, AA6GL. The compressed file includes MOBILE.EXE - the software - plus a desktop icon file.


    Chapter 23 - Transmission Lines

        Two-Wire Feed Line and Radiated Power Calculator - Spreadsheet to calculate the impedance of parallel-conductor line and the amount of radiated power by Dennis Miller, KM9O  This spreadsheet is in Excel format (XLS) and was last updated on 12 Sep 2011. - software to analyze antenna tuners by Dean Straw, N6BV.  The compressed file includes AAT.EXE - the software - plus a PDF instruction file, desktop icon, and associated LOG and SUM file examples.  The program will not run under 64-bit operating systems.  The program has been run successfully under versions of Windows that have 32-bit/16-bit compatibility, such as XP and Vista.  It will not run under 64-bit versions of Win 7/8/10.

  • Supplemental Information and Files

    Supplemental Files Directory - a searchable PDF list of articles and other documents provided with the Antenna Book in the downloadable supplemental information.

    Project Directory - a PDF list of projects in the Antenna Book, sorted by project type.

    Radio Mathematics - a compilation of math basics and online resources in case help is needed with math encountered in the Antenna Book. (Also included in the downloadable supplemental information.)

    ARRL antenna modeling files for the ARRL Antenna Book - the set of EZNEC modeling files represent many of the antennas discussed in the Antenna Book.  The models are grouped in folders named for the type of antenna they represent. A complete description of the files is included on this README.TXT file which is duplicated in the book's downloadable supplemental information.  The models include the new high-performance VHF/UHF Yagi designs by GØKSC created for the 23rd edition of the Antenna Book and discussed in Chapter 15. The GØKSC models require EZNEC/PRO4 for accurate reproduction of the radiation pattern, gain, and other specifications.


    Steve Stearns, K6OIK, has published "Antenna Modeling for the Radio Amateur" - a PDF version of a Powerpoint presentation last updated in 2016.  It covers a lot of background and has many links to other tutorials and references.  Excellent for the reader interested in knowing what other techniques and tools are available.


    K1FO VHF/UHF Yagi designs from previous editions are provided as a PDF document in the book's downloadable supplemental information.

    Chapter 11 - HF Yagi and Quad Antennas


    Rich Haendel, W3ACO,  had updated his two-element 30 meter Yagi design originally published in the QST article “Build the Two Element 30 Meter Beam” in the August 2013 issue.

    1. I changed the taper schedule so the elements have less droop.

    2. I simplified the feed connection to make it easier to build. Instead of the original transformer feed, the coaxial feed line cable is now connected directly to the driven element. An impedance match is achieved by connecting a 0.6 µH shunt coil across the driven element terminals. Ten ferrite beads using #73 ferrite material 0.5” ID, 1.0” OD, 1.25” long, were placed on the coax along the boom. (See the ARRL Antenna Book chapter on Transmission Line System Techniques for alternative ferrite-core choke balun designs.)

    3. Given that the 30 meter band is fairly narrow, it is important to follow the element taper schedule closely. For example, in a recent build, the initial minimum SWR point was at 10.095 MHz. To re-center the minimum SWR point at 10.125 MHz, each of the four element tips needed to be shortened by 1.0 inches on BOTH the driven element and the director.  Antenna SWR tests were made at the base of the tower through a 65-foot length of BuryFlex.  The shift in frequency can be simulated in the model, as well: a 1.0-inch change in element tip section length shifts the frequency of minimum SWR by 30 kHz up (shortening the tips) or down (lengthening the tips).

    An zip file with the updated EZNEC model file, W3ACO 30M Yagi – Revised.EZ, is also available.

    Chapter 16 - Mobile VHF and UHF Antennas

    Dave Patton, NN1N, notes that to avoid scratching the paint under a mag-mount antenna, cut Tyvek (thin, tough plastic film) circles that are the same diameter of the magnets.  Place the film under the magnet and the mount will still stay firmly attached without affecting the electrical characteristics. (The same goes for HF mobile mag-mount antennas.)

    Chapter 22 - Receiving and Direction-Finding Antennas

    Gary Johnson, NA6O, contributed this nice construction article for a useful project, "Handheld Direction Finding Loop Antenna for RFI Location".


    Chapter 24 - Transmission Line System Techniques

    Glen Brown, W6GJB, contributed a photo of how to attach an SO-239 to a 3/4-inch PVC end cap: "You have to hunt around to find 3/4-inch PVC end caps with flat ends - most are domed. Drill a 3/4-inch hole for the SO-239. Solder the lug unto the connector with #6 self-tapping screws before screwing to the PVC cap. Bring the wire to the center pin out the side leaving enough room inside the cap to insert either pvc pipe or reducer."

    You can find more of Glen and Jim Brown, K9YC's choke designs in this chapter.




  • Errata and Clarifications

    No errata at this time.