The Society of Broadcast Engineers

The Association for Broadcast and Multimedia Technology Professionals

AM Directional Antenna Modeling

Originally streamed in 2013.


With the advent of FCC-permitted AM directional antenna performance verification using moment-method computer modeling, broadcast engineers now have a new and powerful tool at their disposal. Qualifying arrays can be modeled and adjusted to the calibrated model parameters in lieu of all the labor, time and uncertainty of adjusting and proofing them using the old cut-and-try method employing field intensity measurements. This webinar provides a detailed overview of the modeling process, including base impedance matrix and sample system calibration measurements, model construction/calibration and derivation of operating parameters from the calibrated model. The FCC requirements for moment-method license applications are also discussed.

Who Should Attend

  • Engineers who are considering relicensing their arrays using MoM
  • Those who operate MoM-licensed arrays that are facing biennial recertification
  • Engineers who struggle with maintaining monitor points
  • Operators of directional arrays with reradiators nearby

Goals and Deliverables

  • Provide attendees with a good working knowledge of the modeling process
  • Give participants the tools they need to assist their consulting engineers with an MoM application
  • Debunk much if not all of the misinformation about MoM modeling/licensing that is out there
  • Define clearly the eligibility of various antennas for modeling
  • Afford participants a “peek under the hood” of the actual modeling process from start to finish

About Your Instructor – Cris Alexander, CPBE, AMD, DRB

Cris Alexander is director of engineering for Crawford Broadcasting Company. He began his career in broadcasting in Amarillo, TX, in the mid-1970s. Obtaining an FCC First Class Radiotelephone License, he worked in the engineering departments of AM, FM and TV stations in that market before moving to Dallas/Fort Worth, where he worked first in television and then in radio, landing in his present position with Crawford Broadcasting Company in 1984.

Alexander is a graduate of the Cleveland Institute of Electronics (CIE) Broadcast Engineering course. He is an SBE member, holds SBE Professional Broadcast Engineer (CPBE), AM Directional Specialist (AMD) and Digital Radio Broadcast Specialist (DRB) certifications and is certification chairman of the Denver SBE chapter. He is an associate member of the Association of Federal Communications Commission Consulting Engineers (AFCCE). He is a partner in Au Contraire Software, Ltd., a provider of broadcast engineering software and database services, including AM antenna modeling software.

SBE Recertification Credit

The completion of this webinar from Webinars by SBE qualifies for 1 credit, identified under Category I of the Recertification Schedule for SBE Certifications. 

Registration and Pricing   

This webinar is approximately 2 hours 40 minutes long.

SBE Members: $62

MemberPlus Members FREE

Non-Members: $92

Register Now

More information about registering using the SBE MemberPlus benefit

The Broadcast Infrastructure Cybersecurity series, like all new SBE webinars presented in 2020, are included at no additional cost for members who renew or join using the $175 SBE MemberPlus membership option. You get all four Cybersecurity modules, plus access to all archived SBE webinars and any new live webinars SBE presents through March 31, 2021, all for no extra cost. Members can renew and newcomers may join online at the SBE website using the SBE MemberPlus option.

Access to the SBE webinars through the SBE MemberPlus program is limited to the MemberPlus-purchaser only.  You are not permitted to distribute, sell, copy, share, project or otherwise make the webinars available to any other individual or group without express written permission by the SBE.


If you have questions regarding this webinar, contact Cathy Orosz via email or by phone at 317– 846-900

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