How can I get MediaPortal TV server to stream cable TV over the Internet so the client can receive it and see it?
Can I avoid using external programs and only use the MediaPortal media center?
If your internet connection is big enough (in terms of upload), you could even opt for a fixed ip address on your network and configure your client to use the remote TV server. You would need to configure your routers firewall, though.
Even though you have a great up-speed at home you should have a solution that works with lower bandwith aswell though. Yes you can have 50 Mbit/s at home, but if you're in a hotel, or out on the road you probably don't have more then 1-3 Mbit/s downspeed. This offcourse changes when LTE starts spreading out.