We participated as part of the San Joaquin Valley Amateur Radio Society's 3A effort, but it was the first real field test of the YP-3 Yagi in a bag.  I had set it up and tested it in the backyard with good results, but I had not had sufficient time to play prior to Field Day.  It had a much more effective range, I am sure, mounted about forty feet in the air on a portable tower provided by our friend W6TE, and 20m was picked through pretty consistently during the twenty-four hour period.  Although we had the stations separated as much as we could within the constraints of terrain and the ARRL rules, we had a good bit of interference between SSB and CW--more than anticipated considering the beam and the dipole were set at nearly right angles as well.  W6TE fabricated some coax filters, which did help.