[Mare] has a visual guide and simple instructions for making DIY mini helical 868 MHz antennas for LoRa applications. 868 MHz is a license-free band in Europe, and this method yields a perfectly serviceable antenna that’s useful where space is constrained. A metric 5 mm drill bit makes a convenient core.The process is simple and well-documented,…

via DIY Mini Helical Antennas From Salvaged Co-ax Cable — Hackaday