LangleyB
Isn't the rule of thumb for obstacles from a windsock or anemometer 10 times the obstruction height? Ie. 6m obstruction must be 60m from obstruction?
Also, I seem to remember that there are factors to apply if your wind measurement isn't at the prescribed 10m. If it's less then you apply a factor of greater than 1 and if it is more than 10m then you apply a factor of less than 1. Ie. 8m wind measurement of 8kts is multiplied by 1.1 and so the actual wind is observed at 8.8kts? (My factor may not be the right factor, but you get my drift?)
LJ