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KCPT will come down about 20dB, but should still have enough signal to be seen through the attenuation of the Jointenna. In actual fact, the 4221 antenna will give him about 10 dB gain, and the JoinTenna will pull that down 20dB. Since he has a noise margin of 35dB on KCPT, he can safely accept the reduction to a 25 dB noise margin without compromising reception of KCPT
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