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Yes, a pre amp is not always a requirement for obtaining a strong or reliable signal.
As evidence. I live 40 miles from Kansas City. I found that with a CB (Channel Bastard) 4221 HD antenna (no pre amp) mounted on a chair in the inside front of my home I am able to get reliable reception for all but one KC station and a station from Sedalia which is 75 miles away. However, when I mounted a CB 4228 (original model) and Antennacraft U8000 on the roof I found that I could not get reliable reception of most signals even with the pre amp. I then switched to a Antennacraft MXU59 on the roof and found I could get every KC signal at 80 to 90% and the Sedalia signal is watchable and reliable if the antenna is pointed in that direction.
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