Help! Recording of net transmissions req!

I've been tasked at short notice to set up a display showing what one of our sections would do on ops.

To make this more realistic, I'm looking for a recording of radio traffic to play in the background. I've tried the usual google searches, but come up with nothing! Ideally, a recording of about 45mins to an hour could be looped, but if anyone can help with ANY form of recording, it would be much appreciated!

Many thanks