Larry contacted me a whe ago about building an antenna for 6m that works! Having to have a multiband antenna of any kind means compromise but for 6m he wanted a serious tool for the job! He decided on the 6.8m long 6el LFA Yagi and here are the results:

The 6el 6.8m long 50MHz LFA at VY0HL

Justin, There she is...finally in the air. SWR is 1.06:1 over the bottom 500kHz.
Features: thru the boom feedline, hybrid and choke balun, thick-walled boom 
w/ minimal sag. Measurements to within 1mm. Just need some propagation 
now! Thanks for all your help. Larry