Better yet, can we make a platform that will levitate and hold whatever size/shape object it wants. The platform would then reflect all the waves back in a dire

Better yet, can we make a platform that will levitate and hold whatever size/shape object it wants. The platform would then reflect all the waves back in a direction, away from the source, in a safe manner. I wonder how much force RF waves can really give? How high above 40Khz can we go?