I was a little apprehended reading all the bad reviews but was determined to follow the good advices and it does work as designed. My unit is functioning properly upon receipt. We do not like all the wires which must be camouflaged or painted or something. I stuck the window unit from the window upstairs. The wire and antenna were dropped out and sneaked back into my first floor window where I usually use the cell phones. All windows can still be closed shut as the wire is very thin and can extend up to 20 feet. This would create the required 10 ft bettween the base and the antenna. Reception is great in our area for both Sprint and ATT except for my house. I have Sprint and we have been struggling for 7 months until I get this unit. It will go to 2 measly bars when I stay close to the black antenna and calls will not be dropped. That's all I can ask for compared to constantly dropped calls and no reception before. Upstairs would not be as bad, but downstairs greatly benefit from this unit. I was planning on getting the expensive whole house unit, but after the husband complained about "I making more work for him installing the unit", I got this small thing and did it myself. Hah! there, it works and I did it myself and it's cheap. If the light blinked red and won't quit, just unplug and plug it back in to reset. I did not expect much and therefore I am pretty pleased with this unit.