I have ImmersionRC - 600mW 5.8GHz A/V Transmitter http://www.readymaderc.com/store/index. ... cts_id=266 And FatShark antenna. http://www.quadcopters.co.uk/immersion- ... -464-p.asp I have Phantom 2. With the Fatshark antenna, the signal is really bad. The signal actually gets worse when connecting. If it helps, I had to buy an adapter to have it fit. BlackPearl has RP-SMA Female and FatShark antenna is SMA-Male. I had to buy an adapter to have it fit. But the signal is worse when connection. When disconnecting the signal is really good compared. What's wrong? When putting my finger around the connection, the signal is somewhat better.