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I'm not sure but I think it might be because the installers didn't get the new antenna up quite as high as the old antenna was, probably a few feet short. I have an older push-up type telescoping pole which is fairly heavy and difficult to work with.
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What you are talking about is called layering; it is possible, but testing is required to confirm it.
http://www.hdtvprimer.com/antennas/siting.html
http://blog.solidsignal.com/content....ANTENNA-part-2
http://www.tvantenna.com/support/tutorials/probing.html
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Could the signal dropouts be a multipath issue due to the lower antenna height?
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Multipath could be an issue at any height. Are there any trees or buildings in the signal path?
Is it 4th or is it 5th?
LG 4200A and the 5th Generation Chip
http://www.avsforum.com/forum/25-hdt...tion-chip.html
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it works for the most part but I know it has an older chipset that probably doesn't handle multipath as well as the newer ones.
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That is correct; the later generations of tuners handle multipath better. A newer tuner might, if the problem is multipath.
What TV are you using? Does it have a digital tuner?
Your strongest TV signal, K18GU-D with a Noise Margin of 55.8 dB and Pwr of -35.0 dBm, probably isn't strong enough to cause preamp overload after adding the antenna gain, but you might end up with too much signal for the tuner.
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html
You have a very strong FM signal KTWA 0.6 mi away with a signal Pwr of +4.0 dBm that is a serious threat to TV reception. The FM filter in the RCA preamp is probably not sufficient to handle it; you should try adding another FM filter between the antenna and the preamp input. See attachment 1.
http://www.mcmelectronics.com/produc...-FM-88-/33-341
https://www.antennasdirect.com/store...on_filter.html
http://comingsoon.radioshack.com/rad...l#.VXR-zzjbJLM
If there isn't enough gain for the weak signals without a preamp, and using a preamp is too much gain for the strong signals, you can optimize the gain by inserting some attenuation between the antenna and the preamp input for the optimum gain needed for your signals. This called maximizing the SFDR, Spurious Free Dynamic Range.