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As a note to all...nvis is usually best when both the sending and receiving stations have similar settups...signal to noise ratio is of most importance...efficiency of the antenna is irrelevant...all antennas have a specific purpose... I have been using near the ground or at ground level antennas on every camping trip my whole radio career and while everyone cannot hear me usually the ones I am trying to communicate with can...my good friends are mostly surprised ...it works for me on almost any HF band but usually 20 meters and down...just my two cents...BTW...been studying military comms since age 9...1971.thanks..kb9ghn