There has been some confusion lately on how to connect your Rx to the Atom V2 Cube. Hopefully this will shed some light on how to attach different types of Receivers.
Please note, you do not HAVE to have a breakout cable. You can solder to the back of the 4 pin connector for a 3.3v output, and then use the same ground and Signal pads for the other wires.
Let me know if you have any questions.