Radio Broadcasting from Online Stream

Thank you for the warm welcome colporteur, yes I'm new to the community.

Greatly appreciate both of your comments and apologies for the lack of clarity. That question was overly simplified and vague.

It would certainly be amateur radio and I feared there could be some local law broadcast violations which I'd look into individually. 

In short, we often attend live sporting events where either there are no RF commentary broadcasts, (but there is online audio commentary available via an app) or there is an RF broadcast in a local language (and the English commentary is available via an app).

Where wifi is available at these events, the signal strength is often poor and it's heavily over subscribed. 4/5g connections are also unstable simply due to the number of mobile phones in the vicinity. Therefore the online audio commentary is inaccessible. 

In theory, I thought "perhaps" it was possible to acquire/configure a device that could take audio from a live online audio stream, and transmit it through a RF to a small group of receivers/headsets.

I appreciate there may be broadcast licences involved and local law also, but wanted to understand how complex this would be to setup.

Thanks again for your comments and quick responses.

Until you said this is an event with 200,000+ people attending, I thought you were trying to accomplish something practical for a small event. There is zero doubt in my mind that whatever stream you want to re-broadcast has some form of copyright. And while I can only speak about US amateur radio licensing laws, I know many other countries share core rules. And a major one is that you cannot do broadcasting--and certainly not of copyrighted content. It is meant to be (primarily) person-to-person communication.

However, to directly answer the question, it is not difficult to take audio and broadcast via RF with a software-defined radio. PC software could receive the internet-based stream and then convert to some suitable audio format that SDR-software could then transmit. An SDR alone would not have enough transmit power for more than a few meters, however.

There are, of course, many technical details in there.Including, how does a listener receive it? Commercial radios would require a commercial license to broadcast.

Even if your goal was to transmit the audio to yourself, you would have to find some frequency band in your local region that allows such usage. And I doubt there is anything suitable with enough allowable transmit power.

Until you said this is an event with 200,000+ people attending, I thought you were trying to accomplish something practical for a small event. There is zero doubt in my mind that whatever stream you want to re-broadcast has some form of copyright. And while I can only speak about US amateur radio licensing laws, I know many other countries share core rules. And a major one is that you cannot do broadcasting--and certainly not of copyrighted content. It is meant to be (primarily) person-to-person communication.

However, to directly answer the question, it is not difficult to take audio and broadcast via RF with a software-defined radio. PC software could receive the internet-based stream and then convert to some suitable audio format that SDR-software could then transmit. An SDR alone would not have enough transmit power for more than a few meters, however.

There are, of course, many technical details in there.Including, how does a listener receive it? Commercial radios would require a commercial license to broadcast.

Even if your goal was to transmit the audio to yourself, you would have to find some frequency band in your local region that allows such usage. And I doubt there is anything suitable with enough allowable transmit power.