What would really help in evaluating all this information is a better explanation of how gravity works.
If a planet for instance bends space/time, then it would be logical to assume that doing so generated some kind of ‘energy’. That energy could be the actual force that ‘attracts’ other bodies. If we knew exactly what part of the EMS that energy was, then maybe we could apply an opposite charge to an object the size of... well an aircraft... it would then essentially be Zero gravity.
I bet that previous civilizations knew what the frequency was and how to offset it. It would explain quite a few things.
OMG that is SO wrong
But it’s very imaginative, and it really is useful to theorize like that, then test.
But OMG you are SO wrong.
Gravity doesn't have a frequency. Gravity is an effect of motion...or rather a slowing of motion.
It works like this: The entire universe is expanding. This means that our reality, all matter, space and time is expanding.
However this expansion gets "slowed" by all objects. Think of the objects as "grabbing" space time near them and slowing it down. However it takes truly massive objects to slow down this expansion.
Take the sun...it slows down the expansion quite a bit. What we call "gravity" around the sun is really a slowing down of the general expansion of space/time. All objects within this local slowdown of space time are caught in this area of slow down.
Same way with the earths gravity. We escape the earth's gravity when we go faster than how much earth is slowing down space time in it's region.
That's why there's time dilation when we travel faster...the faster we go the more we "catch up" to the general rate of expansion of space time.
So in order to time travel we would have to invent something that would "grab" spacetime and practically stop the expansion of space/time within a limited area.