[VHFcontesting] Balun on 6m yagi

[John Geiger]

I hope I can get some clarification or advise from list members on this.  I have a Cushcraft A50-3S 3 element 6m yagi and am getting ready to do a little antenna work this week. Currently I have the coax running directly to the SO239 on the yagi, as the manual states.  Would adding a coax balun (a few turns of coax by the feedpoint) improve performance in any way?  I have seen this recommended for other antennas but the Cushcraft manual never says anything about it.  It does seem that it would keep any stray RF off of the coax shield, correct?  

73s John AA5JG