The Aurora was not an anti-gravity craft as such, but it was made to appear that way.
But before you go be sure to check out
http://www.gravitycontrol.org and have a look at project unity and the rest of it.
Townsend Brown was working with eletrogravitics, which is where the military seem to be stuck at the present time, but this is not gravity control.
The secret physics which allows for gravity control is simply too far removed from mainstream science to be considered by most.
One person who does know the lowdown is Bruce Cathie in New Zealand.