https://stream.echo6.co/videos/watch/281dcd01-5838-43cd-9aba-845f885917ac I built this nearly 30 years ago. It hadn't been used for a long time. I took it off the shelf to try portable with an end-fed 20 metre long wire. It works! Even down to 160 metres! Watch the video to find out more about this very simple one-capacitor antenna coupler. As for coil turns and taps, the smaller (transmitter end) coil has about 4 or 5 turns. The larger coil has a total of about 40 turns. Have taps every few turns depending on how many positions your rotary switch has. Space the taps unevenly to improve coverage at the higher HF end if desired. 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) Wed, 15 Apr 2026 11:42:50 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/281dcd01-5838-43cd-9aba-845f885917ac 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.