"When you charge up a rigid flat plate capacitor to sufficiently high voltage (apparently as little as 5,000 volts in some situations), the whole assembly will develop thrust towards the positive plate (and move in that direction if un-impeded). Brown found that the higher the voltage, the higher the thrust. And the higher the dielectric value of the insulator between the plates, the higher the thrust. And apparently, the thrust developed does not particularly "use up" the high voltage used to initiate the effect."
http://antigravity101.com/
"an equilateral triangle, 8 inches per side, composed of thin sticks of balsa wood. There's a ring of copper wire from RadioShack strung around the top and a strip of Reynolds Wrap held down with Krazy Glue around the bottom.
When I throw the switch, 20,000 volts will course through this bundle of sticks and foil – and it will levitate."
https://www.wired.com/2003/08/pwr-antigravity/
"The most primitive antigravity technology is electrogravitic. This involves using voltages in the millions of volts to disrupt the hold of Earth’s gravitational field. One such electrogravitic technology results in an 89% reduction in gravity’s hold on airframes in such vehicles as the B-2 Stealth Bomber.
Dr. Boylan has been told that the secret Nautilus spacefaring craft uses magnetic pulsing and a form of ultra strong electromagnetic-field technology."
https://www.ufodigest.com/article/12-kinds-of-antigravity-and-reduced-gravity-u-s-crafts/
"The pressure developed in the resonating coil is over half a million volts. "
https://teslauniverse.com/nikola-tesla/articles/teslas-high-potential-and-high-frequency-work
A spacecraft having a triangular hull with vertical electrostatic line charges on each corner that produce a horizontal electric field parallel to the sides of the hull. This field, interacting with a plane wave emitted by antennas on the side of the hull, generates a force per volume combining both lift and propulsion.
https://patents.google.com/patent/US20060145019A1/en