I'm thinking that the current model is a vector field, and not a wave model. I'm not aware of any wave properties exhibited by gravity...
I honestly don't have a coherent theory on gravity waves one way or the other except my general opinion of gravity (its not a fundemental effet, but a byproduct of other phenomena).
I know that I have seen many other sources discussing "gravity waves" and "gravitons", so I would assume that the vector field and the wave model are competing with each other for more credibility at the moment.
I probably tend to favor the vector field model, but but view it as completely possible that it is a wave phenomena
If you really want to complicate it, it just occured to me that it is even more likely that it is both a vector field and wave, much as light is both particle and wave, but again, the underlying causes of gravity are what need scrutiny, not gravity itself.