Video Footage
Spectrum tech can find some Creative Commons film some of your footage.
Images/Photos
Spectrum tech can obtain Creative Commons photos via the Free Media Library or take some photos yourself.
Voiceovers/Narration
Spectrum tech can record a voiceover utilizing the podcasting mics.
Text
It provides additional information for the viewer that the announcer does not have time to say, or it can be a part of your style and tone. Don’t make it too dull, though, otherwise, the public won’t have time to understand it. Additionally, acknowledge the “PowerPoint rule”–don’t read your on-screen text word-for-word in voiceovers,unless it’s a quote.