https://en.m.wikipedia.org/wiki/High-frequency_Active_Auroral_Research_Program , it heats up pockets of the ionosphere using radio waves. I would think you could only influence the ionosphere near the antenna array, with that being said you would have to hope for a butterfly effect of sorts. I suppose the jet stream could be influenced and carry the effect somewhere else. Seems like it would be very unpredictable IMO