Licensed 1987 · ITU Zone 6 · CQ Zone 3
Greg Mihran
Always-free portable antenna plans for the every-ham. Computer modeled, homebrewed, and field-tested.
My mission is to design efficient and effective portable antennas that integrate performance (high radiation efficiency), elegance (speed and simplicity of deployment), and convenience (ease of transport and storage). These designs are always shared for free with the global amateur radio community to encourage more operators to homebrew their own portable antennas.
I have three flagship portable antenna designs that have over 50,000 downloads around the world. Plans to homebrew these and others are always free. Assembled, handmade KJ6ER antennas are also available on Etsy. See the store link below.
Sign up to receive my monthly Antenna Geeks newsletter and you'll be first to get access to new KJ6ER antenna designs, enhancements, and many other ham radio-related topics. Be sure to add my newsletter domain, kj6er.net as a safe sender in your email platform so I don't end up in your junk folder. Browse the monthly newsletters archive below.
Email KJ6ER to JoinHere are my always-free antenna PDFs which are grouped by type. Scroll through the entire list or use the filter to narrow your search. These are all living documents. They are continuously being improved over time. Check back often for the latest revisions.
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If you are unable to homebrew your own KJ6ER antenna, or do not have the time, you can purchase assembled, handmade antennas and accessories at our Etsy store. Feel free to browse through all of these high quality products. Since June 2025, over 200 products have been sold with over 50 5-star reviews.
Visit J-Systems on EtsyTake a look at KJ6ER press coverage and watch one-on-one personal interviews.
If you would like me to present to your Amateur Radio Club, I would be happy to remotely Zoom into one of your future meetings. Let me know what dates are available and we'll get it scheduled. I can speak for 30 to 90 minutes about any or all of my antenna designs and the science that makes them work.
Email KJ6ER to PresentBrowse through all the past issues of the Antenna Geeks monthly newsletter. Sign up to receive these each month above.
A curated list of my favorite ham radio websites that I use everyday.
Get more involved in the KJ6ER antenna community by becoming an esteemed Antenna Hero and/or official Beta Tester of future antenna designs!
Demonstrate how you build and deploy your KJ6ER antennas. Send me a link to a video or a personal blog (portable or at your home QTH) and I'll feature it in an upcoming newsletter. I want to offer a global platform for the creative builders out there to share their tips and tricks with other hams.
Want early access to new designs? Send me an email to become a beta tester! Beta testers receive draft PDFs ahead of release, build and deploy them, and summarize their experience on video. Your feedback helps me improve the PDF, the design, and the deployment process.
My antenna plans are free and always will be. If you have found these to be a useful ham radio resource and want to chip in, donations help cover experimental parts, diagnostic tools, and many long hours of field testing.
Make a DonationI have been licensed since 1987 and upgraded to Amateur Extra in 1991. I received my B.S. Electrical Engineering degree at Case Institute of Technology in Cleveland and worked in Silicon Valley technology companies for 45 years after graduation. I recently retired to design portable HF antennas and share them with the worldwide amateur radio community for free as my way of giving back to this hobby I love.
Always feel free to reach out to me anytime with questions and comments, I'd be happy to help. Keep having fun out there, 73!
