Ham-Radio E.F.H.W. Installation Summary or Is your feed line part of the antenna?
Ham-Radio E.F.H.W. Installation Summary or Is your feed line part of the antenna?. I am indebted to Steve Ellington for making this highly educational and logical video explaining the current distribution on a Half Wave End Fed aerial system.
I have experimented several times with the EFHW aerial and the results at my QTH have suggested that the aerial works much better if orientated in a vertical plane, bending the radiator into an inverted L configuration cut for eighty meters with about 20 feet of the radiator vertical, maximum length of 132 feet was difficult to match and I needed several earth rods connected with short lengths of wire to get a reasonable SWR reading.
I put this down to the vertical section being only at 20 feet high, the other part of the aerial, 112 feet ran down from 20 to around 3 feet above the ground, this is probably what caused the difficulty in matching, the radiator because it was too close to the ground.
Using the EFHW on twenty meters cut at 33 feet and configured into a vertical with a very slight slope worked perfectly without any counterpoise, although I did find that the coax needed to be run at 90 degrees away from the transformer box for several feet my experiments show that this is true with all aerials including dipoles, a choke is, in my opinion, an essential part of this aerial.
Thank you for reading my website posts and I hope you have gained some inspiration from this article. 73 de John G4YDM