It's very rare for anyone in your area to actually get reception of the LA stations. The mountains do a terrific job of blocking the signals.
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They say that their signal is not as strong as the TV Fool Report shows.
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TVFool's analysis does not include important variables such as transmitting antenna vertical pattern or tilt (mechanical or electrical). The TVFool simulation for areas north of the mountains should be treated as "For entertainment purposes only" instead of as a useful tool. You'll get whatever you get (or not). The engineering staff at KABC surely know more about their coverage than anyone else so listen to them.
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Raising the antenna actually made the signal worse, which confuses me.
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Several possibilities:
1. You were getting a fortunate "ground bounce" signal that was reinforcing the primary signal at the lower height.
2. You moved the antenna to a different layer of the signal.
3. The antenna is now picking up an interfering signal more strongly at the higher level.
The noise figure on channel 7 of that amp is terrible, in the order of 5-6 dB. The FM filter comes in very late and is likely to admit the lowest FM frequencies which are the ones most likely to interfere with channel 7.