Best way to get it to work is have a team mate place one down at the same time you do, the more satcoms down at once the more useful it is.

Depending on the amount of SAT COMs are placed on the map, the more there are of SAT COMs the higher the effectiveness is.

Call of Duty Wikia wrote

• If one is placed, it will only show enemies in the player's and allies' lines of sight.
  
• If two are placed, they sweep the entire map to reveal enemies, like the UAV of previous games.
  
• If three are placed, the map sweep will have an increased frequency, also similar to previous titles when multiple UAVs were active. Enemy outlines will also be visible through walls
  
• If four are placed, the map sweep will retain its increased frequency as well as show the direction enemies are facing, like the Advanced UAV or effect of having three UAVs active simultaneously in Call of Duty: Modern Warfare 3.

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sat coms are useless and everytime i put one down i always get killed straight after -_- i prefrered the good old fashioned uavs

sat coms are useless and everytime i put one down i always get killed straight after -_- i prefrered the good old fashioned uavs