A ferrite choke design based on the research of G3TXQ (SK). See http://www.karinya.net/g3txq/chokes/
Takes around an hour to build. You will need 1m of RG58 coax which leaves a bit spare.
Ferrite purchased from www.mouser.co.uk
ps. I did notice some condensation on the choke at the end of the video, so I added a vent.
Hope you find this video useful!
There are other amateur/ham radio related videos on this ianxfs channel. Feel free to browse and subscribe 👍🏻
Ian.