Ah, Springfield, MO. I'm very familiar with the area and its requirements, but I didn't catch that earlier.
Yes, they have a very unique transmitter arrangement. I sat in on a meeting with their Chief Engineer and my boss a while back to discuss what could be done with their DTS.
You appear to be in a valley near Ozark. You have two opportunities for KBRK. They have a tower at Sunshine and 65 but I suspect it is uphill from your location. The other is KWBM in the direction of Bull Shoals.
The CC7780 is a thirty year old design that's basically nothing more than a two-way splitter. Don't waste time on it. You can pick up simple two-way splitter from Lowes or HD made by Ideal that will run circles around the CC7780.
As a preliminary test, can you aim the DB8 directly at either candidate transmitter and pick up its signal? That will tell lot about whether the SR15 project is going to be useful.
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