Do you have a pic of the scope measure? Take one from camera out connected and other disconnected, and another from receiver video out, connected and disconnected from monitor.
Are you using a simple TV or a video monitor?
The Airwave datasheet says that video input of transmitter must have 1Vpp (1 volt peak to peak). Is your camera video out 1Vpp? If higher, it can deform video, and levels are important, since sync and video have separate portions in levels. If deformed, receiver cannot recover it.
And the impedance is important too. Airwave is 75ohms, and you must check camera and TV/Monitor impedance. If you're using a monitor, is it 75ohms charged on loop connector?
Another thing you must try is video without audio, because higher audio levels on transmitter input can make noise that could affect video signal on transmission.
Did you connected all components shown in datasheet?
Is your power source regulated?
Did you try with more than one frequency? And are both (transmitter and receiver) at same frequency?
This images shows video portions (color bar test pattern), so you can analyse if is the sync that is not correct.
Note that scale is not in volts, but in IRE. video portion is 0 to 100 IRE. sync portion is 0 to -40 IRE. Your Osciloscope will show it in volts scale.