by Far the most simple way is a wi-fi converter. Within connect your dLAN adapter to the router and the outside plug in a wifi adapter into an electrical outlet that is being used as a hotspot. The network connection is automatically created. The signal carries not only very far, you can also count at speeds up to 300 Mbps. That is more than enough for audio and video streams. Quite a few devices, you need to harvest when it rains, but the latest generation is dust - and water-resistant.
Example: devolo wifi outdoor adapter, target price: 169,90 euro.