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The main difference in reception now compared to the past is that I am not getting the local PBS on a dependable basis and would like to fix that if possible.
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OK, Dennis. I did another analysis with the idea of improving your reception of WKPC PBS.
1. If you look at the terrain profile in post #6 for WKPC you will see the red signal line just grazes the surface for the last 4 or 5 miles at the right end before it reaches you. It seems likely that trees have grown taller along that path. One of the ways to compensate for that would be to raise your antenna higher. Maybe you can put the UHF antenna on the top. If that is impossible, there are other things to try.
2. The antenna aim is critical for a high gain antenna because it has a narrow beamwidth. It must be aimed at 185 degrees in reference to true north by the green signals lines, or 190 degrees magnetic by a pocket compass, not a smart phone compass.
3. When you removed the reflector rods from the U8000 to make it bi-directional for Indy and Louisville, you lost some antenna gain. If you are willing to give up Indy, you can replace the U8000 with an Antennas Direct DB8E with both panels aimed at Louisville. This will give you more gain for Louisville by adding back a reflector, and because the DB8E is designed to have more gain at the low end of the UHF band where channel 17 for PBS is located. The gain for bowtie antennas is usually lower at the low end of the UHF band. If Indy is still important, you could have a separate antenna just for it.
4. When I aim an antenna, I first aim for max signal strength. I then adjust the aim while monitoring signal quality, as measured by SNR (Signal to Noise Ratio) and Errors. They don't always happen at the same azimuth. My Sony TV has a Diagnostics Screen that gives signal strength, SNR and Errors. Other ways to measure signal quality are with a converter box that has dual signal bars for signal quality and signal strength like the Apex DT502, a SiliconDust HDHR, or a Hauppauge USB tuner with signal monitor.
I can't guarantee that these ideas will give you the improvement you want, but they have the best chance of doing it.