1/4 Wave Ground Plane Antenna center block
thingiverse
This is a simple center block for building a quarter wave ground plane antenna. You just need some solid wire and glue. The four bottom wires go in at a 45 degree angle, all connected to the ground. To determine the length needed: https://m0ukd.com/calculators/quarter-wave-ground-plane-antenna-calculator/ The antenna shown is an AIS antenna. Create your own AIS station with a Raspberry Pi and a DIY antenna by following this guide: https://github.com/innovationgarage/ElCheapoAIS
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