Antenna Orientation is the offset in degrees of antenna element #1 from either True or Magnetic north in fixed-site installations. For example, if the 641 antenna is installed on an antenna tower with element #1 pointing 5 degrees East of North as measured with a magnetic compass, then the orientation setting should be 5Mag.
The Lightning Protection Installed box should be checked if the fixed site installation includes TCI Impulse Suppressors (part numbers 0850-05xx) in the antenna RF feedlines (typically at the Cable Entry Panel).