This "part 2" video summarizes the build, tune and test of a trapped EFHW antenna for the 20, 30 and 40m amateur radio bands. My previous video:
https://youtu.be/KIEZmwB8AHw?si=yKC6pJmZ0JXx9kQe
...shows the process of building and tuning the low power / QRP traps that I purchased in kit form from N7KOM. See additional links in the previous video for details. My resulting wire lengths were:
UNUN to 20m trap: 30'-2.5" (about 9.21m)
20m to 30m trap: 4'-7.5" (about 1.41m)
30m trap to end: 8'-6" (about 2.59m)