Space scanning should have some intuition about gamma rays. You wouldn’t want other systems spying on you, would you? You really need to crank the juice if you’re going to get that far. The high frequency rays we don’t even send because we are concerned about radioactive damage within the atmosphere, but in the space medium gamma rays are very common. We have never sent or received gamma ray data transmissions, although I suspect it is impossible to confuse them with star noise at a tight, heavy burst frequency in the upper range of gamma.
This is obviously a very poor radio: