[TowerTalk] Good vacation antenna

[Wes Stewart]

  So you move the loading coil from the base of the antenna to inside the tuner in the radio (with some coax in between).  How does that affect the radiation efficiency/?
On Thursday, July 3, 2025 at 01:57:33 PM MST, Jim Brown <jim at audiosystemsgroup.com> wrote: 
> https://www.dxengineering.com/parts/cha-ss25
That looks like a great solution, Dave! I strongly suggest against a 
loading coil for 40M, using a tuner built into the radio instead, with 
or without some top loading. Loss in short lengths of decent-size coax 
on 40M is pretty low, even with significant mismatch. An excellent study 
in QEX about ten years ago showed that inductive loading at the base 
greatly reduces the radiation efficiency, because it's at the current 
maxima! The study included the construction of multiple configurations 
of loading, and very rigorous measurements.

73, Jim K9YC

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