You are less than 3 miles from several local stations. The built in amplifier of the CFDTV1a will be at risk of overload. This is not likely to cause damage to the antenna or TV but will result in very poor performance.
If you already have the antenna, try it in your attic as planned... Unless opening the packaging will prevent you from getting full credit for returning it.
If I were in your situation, I would use an all channel antenna such as the Antennacraft C290 or Channel Master CM-3016 or Winegard HD7000R.
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