It’s been a while since this drama was broadcast.
A rebroadcast of the game is scheduled to run on NHK at 5pm today.
President Koichi’s important announcement will be broadcast on television tonight.
You are going to release and send something out. Imagine this message going out through the sky to everyone around you. You are going to broadcast it to the world!
The する is on there to make this noun a verb. Without the する it would be the noun "broadcast."
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.