Thanks to Australian radio amateur Alex (VK2PRC) for this step-by-step guide to making a 20 meter half wave end fed vertical antenna. This antenna doesn't require much space and can be built for a modest cost.
According to Alex, the antenna directs most of its energy toward the horizon at an angle of approximately 15-degrees--excellent for DX contacts.
Here are some comments from Alex:
"A complete step by step guide for, making and tuning a 20 Meter HWEF vertical antenna including impedance matching coupler. If you are unable to make one for yourself, email me and I'll make one for you. NOTE: 1mm enameled wire MUST be used, NO other size!!!!!!! The common mode toroids are F114 core mix 43 MY EMAIL email@example.com"
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https://paper.li/f-1576465810 (breaking Amateur/Ham Radio News).
Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).