I made mine from an old fishing rod and a $10 orange flag from the local safety shop. A aerial bracket from super cheap fastened up to the roof rack, drill 2 holes through the rod and a short bolt through the top hole and an R clip through the bottom ensures it stays on. Cost me $25 to make. I couldnt justify $100 plus for a proper flag
Father in-law uses a 12 foot fishing rod, rings removed and cut just above handle. $3 flag glued and stitched to the top and is base is a bit of galv pipe with a galv to poly screw on joint on it so the rod is snug..
I just went and bought a 4m, 3 piece black willow sand flag.. used Australia wide in the mines and last.. that's good enough for me. It's that big I only ever fit 2 sections, unless is big dunes..
none that I know off mind you being a volunteer in the emergency services has seen me drive a few here in the shoalhaven .
We are heading out west to say good our byes to my best mate and his wife who died last year ,so we going to lamberts to say our farewells and to drive the french line as he would expected us to do ,did I say we would have some beers too lol