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Hi Jeff,
I have an antenna and I just ordered a very accurace scale and a 100.000g weight. I'm going to use an arbitrary waveform generator to emit a 1GHz to 2GHz frequency sweep 1000 times per second. Gravity causes gravitional redshift. This experiment will check to see if it works in reverse. By "work in reverse", I want to see if my frequency sweeps will induce a very tiny curvature in space-time. If it does, then I can measure it using my scale.
The idea is that the emitted frequency sweep has the same wave-function appearance that a gravitational redshift would have. I'm still a few weeks out from performing the experiment. Also, I'm using a WiFi antenna, which I bought for $2. If the experiment doesn't work, I'll assume that I need a better antenna.