This is my 5el. 70MHz. Yagi design by Popa, YU7EF.
Boom is 20x20mm square tube 3m long, and elements are Al. tube13mm(1m. long)- added 10mm tubes to getting the proper length for the 4m band.
All elements and dipol are isolated from the boom with plastic brackets,
RF Choke is made of 12 turns of RG-58 cable to the 55mm plastic pipe, and can "survive" 300 watts of power.
The distance between the ends of the dipole is 20mm and there was put Teflon insulator.
This antenna wins twice, 2011 and 2012, in 9A 50/70Mhz Contest!
9A 50/70MHz Contest
If you want to build this Yagi and have any questions, please feel free to send me an e-mail. . .