Center strain reliever for a 450 Ohm fed doublet antenna.  The wire dimension has been optimized for a snug fit of Davis RF PolyStealth #18 wire.  The window is to prevent water from from pooling around the solder connections.  Screws are 12 mm M4.

I use this for a 100' non-resonant doublet.  Would also work fine for a G5RV or ZS6BKW.

Created using OnShape.  Let me know if you want a link to the OnShape document (e.g. to customize the wire slot dimension).

Printed with 2 perimiters.  0.2 mm layer height.  30% infill.

Print “top” with washer cutouts facing down and support from build plate.

Print “bottom” with nut cutouts facing up and no supports.