On the feed page click on the "Contact Broadcaster" button and the feed provider's page will display.
The feed broadcaster has the option to make the feed anonymous, where this information will be unavailable.
Also the feed provider is using their scanner, computer, and electricity to stream what they want to listen to. You can listen as well if you want to.
NOTE: In Marion County there have been private ambulance companies that provided 911 coverage, namely Stofcheck who recently went out of business.
MedCare may have taken over their coverage areas.