If your’re interested in building a clone of the Alphamatch, a.k.a the “magnetic longwire balun” that was discussed at the October 4th, 2016 meeting, here are some links you might find helpful. I’ve added a link to my hand-out from Tech Net on the Hill!
http://g8jnj.webs.com/cometcha250b.htm
http://g8jnj.webs.com/broadbandhfvertical.htm
http://www.vk5zd.com/CHA250/CHA250_Notes.aspx
http://www.vk5zd.com/CHA250/CHA250_Notes.aspx