https://forums.qrz.com/index.php?threads/cuban-government-jamming-40-meter-us-ham-band.772207/
https://k0lwc.com/direction-finding-points-to-cuba-jamming-ham-radio-frequencies/
https://www.youtube.com/watch?v=1s9TpQSkN9w
https://www.youtube.com/watch?v=gVJS4skdtR8
https://www.youtube.com/watch?v=dtICIDDvnPw