What type of data can be sent using the IGC.SendBroadcastMessage() function?

if (Laser.Status == MyLaserAntennaStatus.Connected)
  {
  object Obj1 = new double[] { OrbitalPeriod };
  object Obj2 = HeightMap;
  object[] Data = new object[]{Obj1,Obj2};
  IGC.SendBroadcastMessage("Sattelite", Data);//Crashes here "Message type object[] is not allowed"
  HeightMap.Clear();
  Laser.Enabled = false;
  }