If there are trees or houses in the way, it's blocking the Signal. Make sure to try again in an open field.
If it's the same in an open field with no interference (Power lines or huge metal things), open up the transmitter and make sure the center mast is properly plugged into the bottom lead marked '5.8Ghz' on it.
Someone reported as that being an issue with theirs.
BE CAREFUL THOuGH!!