https://stream.echo6.co/videos/watch/d3db5820-ce34-45a2-ad10-655696b88718 Describing and demonstrating an end-fed multiband antenna for portable use. It's a full-sized half wave on 20 metres and a loaded half wave on 40 metres. The antenna also works on 10 metres. It's not recommended for use on other bands. A broadband transformer replaces the antenna coupler. While it's likely less efficient than an L-match antenna coupler this arrangement allows instant band changing. Its only disadvantage is that its bandwidth on 40 metres is somewhat narrow (150kHz approx) when used with the loaded half wave wire described. Similar to the Par Endfedz design this transformer will work on other bands with a half wave wire. With 10m of wire I could get low SWR (as indicated by the FT-817's indicator) on 20 and 10m. 20m of wire gave those two bands plus 40 and 15m. Some variation of the trimmer will however be necessary so it's worth carrying a small screwdriver, preferably attached to the transformer unit to prevent loss. There's a bit of cut and try in construction. Those wanting a premade unit should investigate either the Dutch HyEndFed or the American Par Endfedz 40/20/10m end-fed models. Both have received good reviews on eham.net . Contents 0:00 Introduction 0:50 Where I got the idea from 1:08 Circuit 1:15 Key dimensions 1:22 Construction 1:42 Loading coil 2:01 Impedance maching unit 2:47 Antenna wire 3:11 Putting it up 3:27 On air 3:50 Summary Check these links for further info: http://pages.suddenlink.net/wa5bdu/efhw.htm, http://pa-11019.blogspot.com.au/2012/04/149-transformer-for-endfed-antennas-35.html, http://www.hamradio.me/antennas/lnr-precision-ef-102040mkii-examination.html, http://www.eham.net/ehamforum/smf/index.php?topic=56161.0, http://pa3hho.wordpress.com/antennes/multiany-band-end-fed-english/, http://www.hyendfedantenna.nl/joomla/blog/17-multi-band-hyendfed.html, http://www.parelectronics.com/end-fedz.php, http://www.eham.net/reviews/detail/5105, http://www.mwrs.org.au/wp-content/uploads/2014/08/Three-band-End-fed-Half-wave-Antenna.pdf, The USA contacts included were on 20 metres, made in the morning. Good contacts have also been made within VK on 40 metres. If you prefer to buy rather than build consider this MFJ version. http://ebay.us/GrQsTA (Note: I receive a small commission on sales at no extra cost to you) PS: If you liked this video please consider supporting Amateur Radio VK3YE by: Subscribing on YouTube, Checking my books page at https://books.vk3ye.com ​​​​​​​​​​​​​​​​, Shopping on Amazon via: https://amzn.to/3iiDQXv , or, Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you) Sat, 09 May 2026 09:26:36 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/d3db5820-ce34-45a2-ad10-655696b88718 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.