Hi Sledge73,
I understand that you want to know if items shared through Home Sharing on your home Wi-Fi network are able to be streamed when away from your home Wi-Fi network. The answer is no, in order to access items shared through Home Sharing, you must be on the same Wi-Fi network as the computer sharing the files:
Home Sharing enables you to stream or transfer music, movies, TV shows, apps, and more among up to five authorized computers in your household. To do so, turn on Home Sharing on each computer using the same Apple ID. Once you've turned on Home Sharing, all of the libraries from your computers will show up in the Shared section in the upper-right corner of iTunes. If you don't see the shared section in the upper-right corner of iTunes, double-check to make sure that every computer is on the same network.
Learn more about Home Sharing - Apple Support
https://support.apple.com/en-us/HT201976
Take care, and thanks for visiting the Apple Support Communities.
-Braden