Fastest No Tune 80-10 EFHW NVIS Antenna-Chalk Line-Based Ham Radio Antenna.
If you need to set up a NVIS (Near Vertical Incidence Skywave) at home or in the field, then this well-constructed, easy-to-understand video from the "Bucktail Outdoor Resources" website is for you.
This antenna is an EFHW using copper wire and a chalk line reel. The antenna doesn't require a "tuner" to cover 80m through 10m.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=izwUdCeYlX4
Here are some comments from "Bucktail Outdoor Resources":