That is true —, though I think rafaelsorgato was trying to go from the Ship to the Antenna, rather than from the Antenna to the Ship. Still, it's a good piece of information to know.
As for the Antenna physics, rafaelsorgato,
I might be wrong, but I don think the pin behavior works with the Physics behavior.
What you might want to do is make the Antenna a non-Physics object, and pin it to the Ship physics object. Then the Ship does all your physics, and the Antenna is just a sprite along for the ride.
If you need the Ship to break into physics pieces when destroyed, and the Antenna is one of them, then you can replace the live sprite Antenna with a dead physics Antenna at the moment the Ship is destroyed.
If you really do need the live Antenna to use physics, so it can flex around while the Ship moves, you can try attaching it to the Ship using a physics joint, but if you do, the Antenna will change how the ship controls and moves, unless the Antenna has very low mass.