Maybe 120 mile diameter. We live in the country, 60 miles from Columbia, SC and 60 miles from Charlotte, NC. I know the direction of the towers, but this antenna doesn't seem to be too directional. Wherever I turn the antenna, I only get a signal from the Columbia area. I have a big antenna for the house that is a 60 mile antenna and it gets the signals from both cities. Whichever way I point this Supersonic, I only get a signal from one direction. I still get more signal than my homemade antenna, though. For $20, it was worth the money.
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