Building a Short 40m Antenna With Coil and AT-271 Whip.

Things did not work as expected with this great design by VA3TNE on Thingiverse. The coil is used with an AT-271 military antenna whip, 3D printed and tested here with my TRC-372 manpack radio at the Col de Vence North of Nice. Maybe someone more experienced with coils could shed some light on the issue...
STL 3D files: https://www.thingiverse.com/thing:235...
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