After building my ZS6BKW, I purchased a 80m-6m 55ft EFHW w/9:1 UnUn by Nelson Antennas which he no longer sells, now sells an 84ft version on eBay.

This antenna, per his recommendation, was put up as a sloper with the end at about 28ft up and the feedpoint at about 4ft off the ground. Generally take it along with the ZS6BKW on the portable setup or whenever I travel. Depending on the terrain and if there is space available, I may add a 20ft counterpoise and make this antenna work better.

I have worked all states and the world with this wire antenna, including one of my most memorable contacts with North Pole, AK.