Thank you everyone for your response so far! I was wondering if anyone knew more about the effect they have on ATC radar? Research I have done has found a lot of evidence saying clutter shadows etc on radar is a problem and has been investigated. However, I'm getting a lot of mixed response some people saying they have no effect at all, others saying it can be a big problem. I assume this depends on where the farms are located in regards to the radar signals but there is a lot of varying response about this issue.
Thanks lonewolf good info!