Resources:
- https://www.youtube.com/watch?v=VhbYAN_txR0
- https://sq9tla.pzk.pl/index.php/2018/02/06/antena-dipol-na-2m-70cm/
Both images taken at the same time but with 2 different rtl_sdr devices. The results are the same even if the dongles are switched.