I want to calculate the effective wind area of a 2" diameter mast that is 72" long. Therefore 72" X 2" = 144 sq.in = 1 sq.ft. The calculation above would be accurate if the mast were square. But because it's round isn't there a constant I neet to multiply the result by. If anyone know this constant please let me know and also tell me its source such as EIA-222, etc. Thanks. Gene WD8OZL