This is the talk that I presented at the RSGB Convention in October 2018.

Update: RSGB have now released the video at https://thersgb.org/members/resources/?id=5762 (member login required; it will probably be several more months before the video is transferred to YouTube).

I always cringe to hear myself talking, but the sound track does add some context to the previously released slide pack ( still available here ).

Even without the voiceover, the important points are clear:

• Today, “baluns” are about controlling interference, reducing noise
• Choke baluns are best for doing this.

So we should aim to:

• Minimize common-mode RF currents on the outside of the coax
  and along the boom.
• Don’t upset the good feedpoint balance that VHF-UHF Yagis already have.

Comments and discussion, please!  This is new information for VHF-UHF, and certainly not the last words to be said about it. It’s still very much ‘work in progress’.
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Technical slide content © 2018 Ian White, GM3SEK
Slide template © 2018 RSGB
Images as attributed (except where that would be embarrassing).