End-fed longwire antennas

These end-fed antennas are quite popular, but a 9:1 transformer is usually needed to bring the impedance down to levels that a typical rig's ATU can match. Often less than 3:1 VSWR can be obtained on all HF bands with such a transformer, so a rig's internal ATU can usually bring this down to 1:1.

See https://pa3i.jouwweb.nl/antenne