I may not be understanding what part of the operation you are talking about. but radiated power? no transmitter had megawatts of radiated power. 50Kw for a fm broadcast antenna is a common number passed around. The huge "voice of america" shortwave station was 300Kw.
I have heard of military radars having megawatts of radiated power. but even then it was in the low megawatts.
For UHF television stations, the effective radiated power (ERP) is typically 1 Megawatt. That is accomplished (for example) with a 57 kilowatt transmitter and an antenna with 12.44 dB gain.
Up in the UHF TV bands, huge transmitter power was required. The FCC allowed 5 megawatts.[1] Few stations actually used that much power, but 1 MW was not uncommon.
Amusingly, over-the-air digital TV is making a comeback. The cable industry pushed prices up too high. But the "comeback" is to only 14% of the viewer base.
I have heard of military radars having megawatts of radiated power. but even then it was in the low megawatts.