Question - How to stop interference on Wi-Fi signals from router to devices?

My wireless signal for my router to my Roku box seems to have a lot of interference on it no matter what channel were on. Will a Wi-Fi Extender solve

My wireless signal for my router to my Roku box seems to have a lot of interference on it no matter what channel were on. Will a Wi-Fi Extender solve this problem or is there a way or device you can put a firewall in to protect a wireless signal?

or:My wireless signal for my router to my Roku box seems to have a lot of interference on it no matter what channel were on. Will a Wi-Fi Extender solve this problem or is there a way or device you can put a firewall in to protect a wireless signal?

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