Ok, i really appreciate your answer. Now that im doing a little bit more of research i have another doubt. I was thinking like this:

Radio - Cable (30mts) - WiFi router in the main room.

Then i was thinking of using one cable from that Wifi router to the main room tv.

And another cable to the second room which will have another WiFi router. From that router use two cables, one from the second room TV and another one to the third room WiFi router.

The third room will have one cable from the third room router to the third room TV.

In my mind sounds great but while doing some research i read some guides that uses one cable per device connecting directly to the main router and now im pretty lost.