Which end fed half wave transformer should you use for running high power? #hamradio #antenna

XXXXX Please refer to this updated video instead XXXXX https://youtu.be/OCZgeY90OjU This is my opinion on the efficiency of 3 stacks of FT240-43 & FT240-52 cores. Linknto my spreadsheet of results - https://docs.google.com/spreadsheets/d/1q5N9B5lVQKdO5xucCdzk4RNqKArwBzum/edit?usp=drivesdk&ouid=111484348574912642065&rtpof=true&sd=true Link to the part one video - https://youtu.be/nZ-G4hJCTSM Link to the method of measurment - https://youtu.be/TZjY2Jim7fY Link to my EFHW playlist - https://www.youtube.com/playlist?list=PL4c9JYrasWlINtL3wR7MZ5IDSYSEYj6It