This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Rapsh. en For article Slot antenna in ru ru The image was scanned from book and then edited Author is but create it by information from book of russian scientist Ayzenberg Antenna diagrams
Page 2023 Free-images.com. All images are Public Domain