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I am looking for antenna that will be able to receive ABC, CBS, FOX, and NBC.
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They are very weak, and Fox KFXV on real channel 20 is the weakest.
The problem is that KTLM is about 50 dB stronger than NBC. If it weren't for KTLM, you might have been able to pick up NBC with your antenna, but its 30 dB preamp was probably overloaded by KTLM.
The ideal solution would be a custom filter (expensive) to make KTLM on real channel 40 weaker so that you could use a preamp for your weak desired channels.
Without that filter, the best you can do is aim a high gain antenna, like the Winegard HD7698P, at about 105 degrees magnetic, and let the antenna pattern make KTLM weaker because it is in a different direction.
It might be possible to add a medium gain preamp like the Antennas Direct Juice that is resistant to overload, but then your tuner might be overloaded.