Small UniDirectional Loop Antenna (SULA)

[ka3jjz]

Curious if anyone built one of these?

Introducing the amazing SULA: An affordable unidirectional DX-grade loop antenna that you can build!

Many thanks to SWLing Post contributor extraordinaire, 13dka, who brings us a three part series about the new SULA homebrew antenna project. This first article describes this affordable antenna and…

swling.com

Small Unidirectional Loop Antenna (SULA) Part 2: Construction Notes

Many thanks to SWLing Post contributor extraordinaire, 13dka, who brings us Part Two of a three part series about the new SULA homebrew antenna project. This first article describes this affordable…

swling.com

Small Unidirectional Loop Antenna (SULA) Part 3: Questions & Answers

Many thanks to SWLing Post contributor extraordinaire, 13dka, who brings us Part Two of a three part series about the new SULA homebrew antenna project. This first article describes this affordable…

swling.com

There are 2 versions of the transformer that is mentioned in the construction article, and you must cut R1 to get the isolation. Both versions
are shown in this thread from the SWLing.com forum

Balun One Nine: cutting R1 - SWLing Post Message Board

Mike

 

[13dka]

I know of only 2 other existing SULAs besides mine, one in South Africa and another one in Japan. The one in SA can be seen here (together with a few more vids from mine not shown in the SWLing Post article) and also on YouTube, with 2 videos from Japan:

https://www.youtube.com/results?search_query=SULA+antenna