On portable operations I use a 2 x 13.4 mtrs doublet that Ken GM0AXY described on the sota reflector. I'm very impressed with it on 20m - 10m, it's working OK on 40m and it's working on 80m. I have read that you can improve NVIS performance by laying a wire on the ground beneath the antenna but I've not tried this myself yet.
Here the other day I discovered an article about the antenna by Casey NA7U.
http://www.tomochka.com/na7u/doublet/w4rnlbackup.html
30m QRP FT8 (Thursday)
9 hours ago
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