446 Mhz PMR Moxon handheld antenna for Baofeng DM32-UV HAM radio and the likes.

Description

Small update: The diameter of the plastic choke (where you wind the cable) has been reduced from 40mm diameter to 35mm. The smaller version works similar to the bigger version, but is a bit more pleasing to look at and prints a bit quicker. There is no need to change the 40mm version to the 35mm version on already printed antenna's.This is a mobile Moxon directional antenna tuned for 446 PMR frequency use. The design takes into account dielectric loading where copper wire becomes electrically a bit longer when it's (partly) surrounded by plastic. To compensate, the actual design needs it's dimensions reduced ever so slightly. This is why the dimensions of this design differ a tiny bit from the Moxon antenna calculator screenshot.According to ChatGPT the best approximations are:A241,3 mmCompensated value: 239,5–240,0 mmB31,4 mmCompensated value: 30,9–31,1 mmC11,8 mmCompensated value: 11,3–11,5 mmD46,5 mmCompensated value: 45,8–46,1 mmE89,7 mmCompensated value: 88,8–89,2 mmThe Moxon antenna is relatively small and has good directionality. It's default vertical position matches with the vertical polarisation of rubber ducky antenna's. The 5 winding's (the choke) at the front prevents the outside of the feed wire to become an electrically active part of the antenna which helps with directionality / sensitivity. ChatGPT calculated 5 windings and a 4cm diameter (the diameter of the plastic choke holder is therefore 35mm) and assured me that, despite it's position and relative size…