I wanted to look at your FM signals to see if they might be causing interference to your TV reception. I made an estimate of your location for a tvfool report that seemed to match yours:
http://www.tvfool.com/?option=com_wr...f1f071e1da6fc9
and I used that location to generate an FM FOOL report. See the attachment.
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Multi-path is, by far, the most common type encountered. Small, not very directional antennas like the one you have are most susceptible to this issue.
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I agree with ADTech. A more directional antenna
might help.
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I have it pointed at some transmitters located LOS 4.7 miles away. I know it's pointed in the right direction because I can actually see the transmitting towers from my roof
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Channel 17 is not on that tower, it's on a tower at 5.0 miles away at a different azimuth. With an antenna that isn't very directional, it probably wouldn't make any difference, but what could it hurt to rotate it a little to the right? You could try a more directional antenna like the RCA ANT751.
There is a good chance that you are getting a reflected signal of CH 17 off the ridge at the rear of the antenna that is causing interference to the direct signal. An antenna with a good Front-to-Back ratio might help.
There is also the possibility of FM interference. Your strongest FM signal is KRJC with a strength of -16.8 dBm. It wouldn't cost much to insert an FM filter in the RG6 coax line as a test, but it would knock out real CH 6.
http://www.mcmelectronics.com/produc...-FM-88-/33-341
https://www.antennasdirect.com/store...on_filter.html
Is your coax grounded?
The coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety and to
reject interference. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge, but the system will not survive a direct strike.