1. If you took a positively charged antenna and shook it up and down 500 million times a second, would it emit a radio wave. If so, why? If not, why not? I would say, the EM wave that it emit is heat due to friction with the air. anyone have any other suggestion. 2. Electric charges are what emit radio waves, so why can't the cellular telephone emit a radio wave by just putting a positive charge on its antenna permanently? not sure on this answer though.