https://www.rtl-sdr.com/wp-content/uploads/2018/02/Directional_MW_antenna_24jan2018-v2.pdf?ffccfa&ffccfa
https://www.aytechnologies.com/TechData/HowToBuild.pdf
Kaupallinen toteutus:
https://remoteqth.com/k9ay-loops.php?fbclid=IwAR131YdFHRJOQ_D7ynkD7kX5lA07dQ2ILLfbpkrgyqcHSMKILAqvQAJu5_Q