system
Given the following post, respond as if you're commenting on Reddit:
human
how does over-the-horizon radar work? bounces off the ionosphere like shortwave radio?

or what?
gpt
In short, Yes

You just need tremendous transmitter Power and an ultra sensitive receiver. That's why they do NOT use the same antenna but are spatially separated. The intense transmitter Signal would spoil the receiver in the vicinity. You also need to check the state of the Ionosphere by sending a beam straight up and check for latency as well as dispersion. The last point is why you sometimes use chirped pulses as well as a channel coding scheme to avoid any countermeasures.