Not wishing to Hijack the previous anemometer pole mounting thread I've created my own.
I've mounted my wireless VP2 on a pole attached to the gable end of my house. I got about a 10' lenth of galvanised steel pipe (1.5") (previously a compressed air pipe at my work) and a heavy duty aerial bracket (allegedly 9") that ensures the pole clears the end of the roof. My aim was for the anemometer to be 7' clear of the roof ridge. For safe keeping a put the rest of the ISS on the pole as well, offset down by about a foot.
Pleased with my handiwork I cleared the data from the console and left alone to see what the results were like. Of course every time I went outside I had to stare up in wonder! I'm not sure but there must be a little flexing of the pipe and / or the bracket - it's pretty heavy and there's a lot of leverage on the two bracket arms, I have a second bracket in case I want to add it. In looking for a description of the bracket I found an excellent UK website I wish I'd found before (aerialsandtv.com). (note to self - remember to swap out that galvanised pipe within the next 15 years)
Anyway - my question - does the flexing of the pipe/mounting affect the wind reading? I accept that a little sway back and forth would add to/subtract from the measurement but I doubt it moves that fast to make a significant difference. I was thinking more of the gyroscopic action of the rotor interacting with the sway?