NOAA on my station. (41-Chicago1)

My station has been receiving NOAA APT images for a while now. I just now noticed that looking across them images from different observations I can see static lines that line up with each other. To me this means that the lines are from an obstetrical between me and the satellite.

Example Obs

Sort of neat. Might try an experiment to map whats blocking it. xD

It could be nulls in the antenna pattern.

Could be also. I have found it to change depending on the way the sat passes over head. I might investigate that too.