DEF CON 27, Ham Radio Village, Mark (KR6ZY) Smith's 'Hunting Tape Measure Yagis And Offset Attenuators' → January 02, 2020 by Marc Handelman in Amateur Radio, Conferences, DEF CON 27, Education, HAM Radio, Information Security Thanks to Def Con 27 Volunteers, Videographers and Presenters for publishing their superlative conference videos via their YouTube Channel for all to see, enjoy and learn.