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.

To clarify, I'm talking about race events where attendance is between 200,000-300,000 people in attendance.

I'm thinking you are describing a problem most of us have experienced. I have problems with wifi at my local sporting event with less than 100 fans in attendance. Heck my daughter at here home has the problem on wifi and streaming. I moved her TV service from wifi to CAT5 and she has never complained since.

The Canadian Football league has some RF broadcasts for games. I would sit with an AM transistor radio in my ear to hear commentary while watching the game. That is a commercial broadcast service.

I might understand your problem but not sure I can provide a workable solution.

I'm thinking you are describing a problem most of us have experienced. I have problems with wifi at my local sporting event with less than 100 fans in attendance. Heck my daughter at here home has the problem on wifi and streaming. I moved her TV service from wifi to CAT5 and she has never complained since.

The Canadian Football league has some RF broadcasts for games. I would sit with an AM transistor radio in my ear to hear commentary while watching the game. That is a commercial broadcast service.

I might understand your problem but not sure I can provide a workable solution.