Missing build instructions (404)
https://gitlab.com/librespacefoundation/satnogs/satnogs-antennas/blob/master/Helical/UHF-435-8-version_5/Readme.md links to https://ohai.satnogs.org/project/UHF_Helical_8/hardware/ which results in http 404. Archive.org does not have a copy.