After playing around with mathematical modeling ([[End Fed Half Wave Antenna Theory]]), I made one, and it has served well, making a brief contact with VK5PAS from Charlton, Victoria on 21/12/15, and on the [[Overland Track Hike|Overland Track Hike Report]].

Antenna height does change characteristics, with the tuner able to tune 80m with sufficient height.

[img[]] //FT-817 with EFHW tuner directly plugged into the front//

In the above photo I have a counterpoise going towards me and the headphones acting as an additional counterpoise, this seemed to reduce local noise (created by battery pack) by two S points.