A:AnswerTry a Wi-Fi extender that will boost the existing Wi-Fi signal.
TP-LINK - Wireless N300 Wi-Fi Range Extender with Ethernet Port - White
Model: TL-WA850RESKU: 2080012 les than $20.00
A:AnswerYou probably know by now, but just in case - The price is the same regardless of the Streaming Box you use. PC, Roku, Apple TV, etc are all the same price.
A:AnswerThe main difference, besides size, is that the Roku 3 can connect via Ethernet or WiFi, as opposed to WiFi only for the Stick. The Roku 3 (2015) also has a ear phone jack in the remote for private listening. Other than those, they run and play the same.