This is a recording of DF9IC Henning’s lecture at the 40th Nordic VUSHF meeting June 9 2018. In the lecture Henning describes some of the ideas behind the 144 MHz antenna design at DR9A. Every station who has worked with multi antennas should watch this lecture. There are a number of outstanding insights and ideas on how to improve your antenna system. It is a real amateur video, so please bear with the sound during the first couple of minutes, it gets better.
The link to the video on You Tube can also be found here.