Rick,
I simply cut down an over the road lumber marking flag made from porous nylon scrim (picked up off the highway), attached it to a cut down CB SS whip with washers welded on at 12" centers, mounted on a spring base mount and have no problems in several trips out. I fly the Stars and Stripes above the required orange flag and mine are way up over the required 10 feet from the deck. No problems yet.