Monday, July 13, 2026

K6ARK ultra light endfed antenna

 After I finished the micro match I finally had some time to build the actual antenna. I took about 21m very thin insulated copperwire and fit a coil of 10 windings (coil form supplied with the kit) in on about 1,8m from the micro match. Everything is described on K6ARK's website. Then I cut the wire back till I had the best match on 7,1 Mhz, the center of the 40m band. This is the final product on the red cutting board, see picture on the right. I had to cut back about 1,5m in total. The black cable tie is a reusable one, I found it excellent to mount the wire to a low tree in my garden. Below some pictures of the SWR/R/X. Big surprise was the SWR in the CW part of the 10m band which is a surprise for me. I can now use this antenna on 4 bands without a tuner.




I had the idea to saw a antenna wire winder from the red cutting board. But it would be a lot of work on not nearly as effective and light as the UL antenna wire winder that can be 3D printed with the print files from K6ARK. But I haven't got a 3D printer! However I know another HAM (PC3EK Eddy) in my neighbourhood who builds his own 3D printers. So I asked him if he was able to print a UL wire winder for me. This was asked at 8:20 this morning and he delivered the printed product for free at my job at a few hours later. Wow, I was impressed and grateful for his help. The final final product is shown below.


Look at the incredible weight of this 4 band endfed. Only 93 grams. This is truly ultra light.

Now I need to test this antenna. Not sure if it will be at home or in the field. It will be a surprise.

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