I updated the mod with a basic description. If you have any better wording for the description please let me now.
[entity-name]
radar-signals=Radarsignal combinator
[entity-description]
radar-signals=Place next to a radar. Set Signals to retrive. Units, Worms or Spawner Signals.
[item-name]
radar-signals=Radarsignal combinator
[item-description]
radar-signals=Place next to a radar. Set Signals to retrive. Units, Worms or Spawner Signals.
[technology-name]
radar-signals=Advanced Radarsystems
[technology-description]
radar-signals=Unlocks radarssignal combinators that will output the amount of entities found in scanner range.