# Around the world propagation?

Is it possible to transmit a signal around the world and receive it? Has anyone done it, and how? If not, how could this be accomplished? Assuming a complete path around the world, what kind of time delay should one expect on their transmission?

It's possible on HF (and below), and people have done it. It takes some combination of:

• high power transmitter
$$\frac{24901.47\text{mi}}{c} \approx 134 \text{ milliseconds}$$