He got the board up and running, and even made his own custom helical coil antenna. The case was 3D printed out of PLA. It’s a tiered cylindrical bobber. The wider top section floats on the ...

[David] wasn’t completely unprepared, as he did have the loading coil for his portable 20 m antenna, but was missing the telescoping whip. He calculated the whip length should be around 20 cm ...