You can stream RTP content online on its streaming platform called RTP Play, which is also available as an app on mobile. It includes channels like RTP International, Memória, RTP1, RTP2, and RTP3. You can also watch RTP content on demand on the RTP Play site and app, like popular TV shows that stream on RTP channels. However, most of the content on the platform is only available in Portugal.
A VPN with servers in Portugal can access all kinds of RPT content on RTP Play from anywhere. The VPNs on my list have multiple servers in Portugal that work with RTP Play.