system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do live TV hosts experience delays when talking to reporters on the scene?

 Like,  it's the current year, if I fire up Discord, Skype or even FaceTime I  can talk to or video message  people on the other side of the country  with close to zero lag, as if they're right here with me. Still, when I  watch TV sometimes I see that there's a delay in the communication  between the host and the reporter on the scene, even if they're in the  same city.

\- So, we have Jim on the scene to bring us the newest news  
\- \[camera focuses on Jim, 3 weird seconds passes\]  
\- Oh yeah, John, we're here with Ms. Davis who lost all her belongings on the Godzilla attack...
gpt
All the apps you mention have the benefit of being able to use existing ground infrastructure; wifi is within a few hundred feet at the most and cellular a few miles before it is onto ground lines. Those are great if you can get them, but the field reporters want to be able to ensure they can speak without interruption which means they need to control every step of the network.

To do this they typically use satellite communications, only needing to have a clear view of the sky from their van to form a video link no matter where they are. The penalty is that the much longer round trip distance causes a slight delay in the communications.