I be in San Francisco Bay Area , use Comcast cable modem . after install this device , my internet connection stop work . it seem downstream be okay , but the upstream signal have problem . after remove the device , my connection work just like before . I be hope this device can get I a better upstream power level since mine be at the boderline , but no luck for I . on the side , watch out for the 75 ohm terminator seller offer . for my case , I be not pay attention , just click what seller recommend and trust the prime label . I end up pay $ 9 shipping for a $ 3 part . Amazon say it be my fault , and yes it be . but how can Amazon allow seller to put trap to trick Amazon 's customer . who be fault be it really ??