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Reader mail: My condo's shared Wi-Fi signal is weak. Any ideas?Mary Ellen writes: Is there a device that would pick up and strengthen a Wi-Fi signal? I have a condo in a building where Wi-Fi is provided but it is shared by another unit, and the router is not located in my unit. Although my smartphone can receive emails etc., my Roku is constantly buffering. Is there a device I could buy to pull the signal in stronger so I can stream movies and shows on my Roku? Read More