Chapter 2: Installing the system8 Placing the antenna2.2 Placing the antenna2.2.1 ObstructionsThe antenna rotates 360° and down to –25° for theSAILOR 500 FleetBroadband and -60° for the SAILOR 250 FleetBroadband inpitch and roll, to allow for continuous pointing even in heavy sea conditions.Any obstructions within this volume can cause signal degradation.The amount of degradation depends on the size of the obstruction and thedistance from the antenna. As a rule of thumb any obstruction that subtendsan angle of less than 3° at the antenna has limited effect. The table belowgives a guideline for obstruction sizes, which will cause limited degradation.Distance ofObstruction Size of Obstruction3 m 16 cm5 m 26 cm10 m 52 cm20 m 104 cm
