Internet options for RVers are as follows
Cell phone as a hot spot or Cellular "hot Spot" (My-Fi device)
Park Wi-fi
Two way Satellite TV
Recommended for a ROKU: None of the above. And I'm serious about that.
Cell: Most plans are lmited, T-Mobile gives you unlimited DATA but only part of it is 4G, once you hit the "high Speed Limit" your speed drops.. big time.
Park Wi-Fi is usually not broadband enough to support multiple video streams (in many cases even one)
Two way Satellite, like Cell, has data limtes,... Hughes is still, far as I know the only provider with a "CONUS" (Contential US) Foot print satellite. and it's also expensive.