
I came across these filters by accident. I live about 2 miles from a cell tower. I have 4 TVs each using a thin indoor antenna with a range of 25-50 miles. I have antenna holders on my walls and each antenna has its own signal booster. I put a filter between the antenna and the signal amplifier. I tried rescanning OTA channels and actually lost the channels! I decided to unplug the TVs for half an hour to "reboot” them, remove the signal boosters and rescan the OTA channels. 2 TVs actually work better without signal boosters and 2 still need signal boosters. I live near Detroit, Michigan and our area is flat. I went from less than 20 channels per TV to 28-32 channels per TV. Signal strength and quality have improved significantly. A local station's signal isn't always reliable, but I have access to almost all local stations, including PBS in Toledo, Ohio. For me, these filters work very well and are worth the money. Hope my experience can help someone.

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