There is a program I've been using for a number of years, and while it relies on hobbyists supplying the feeds, and there is not always coverage for your area, I've found it most useful. There is an older review of it <<HERE>> that may interest you.
Some of the things I really like is it's integration with Android Auto that lets me control it through the touchscreen in my car. For home use I've been using an old retired smartphone with WiFi access to my home network. It can also be configured to give you notice of major happenings anywhere in the country, usually BEFORE you hear about things on the news.
So if you are just getting into scanning, have no scanner, no antenna, or no money to even buy one, it's a really inexpensive way to "try on the hobby". I've considered making a YouTube video on this amazing little program, if that interests you let me know.