Welcome to the forum, Bob:
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one of them recommended installing two antenna’s in the attic – specifically two yagi antennas.
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I agree.
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I could couple the two coax lines from the antennas into a splitter
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A splitter can be used in reverse as a combiner, but it doesn't always work because when the same signals arrive at the combiner they will interfere with each other if they are not in phase. In your case you should combine two antennas, one for VHF and one for UHF with a UVSJ, which is a low loss device that combines the two bands without interference.
The signal loss in an attic is difficult to predict because of differences in construction. A metal roof, aluminum thermal barrier, aluminum siding, and stucco will block signals, as will trees and other buildings.
For KFMB CBS on real channel 8 and KGTV ABC on real channel 10 install a Winegard HD7694P aimed at 230 degrees magnetic. The 7694 is a VHF/UHF combo antenna because VHF-High only antennas are now in short supply.
For KSWB, down thru KNSD, install an Antennas Direct DB4E aimed at 144 degrees magnetic.
I have selected antennas that will give a little extra gain because your 2Edge signals might have a hard time making it over the terrain obstructions. You can see the terrain profiles if you click on callsigns in your TVFOOL report.
You probably will not need a preamp, but if you run out of signal after splitting, you can replace the splitter with a distribution amp like the Channel Master 3412 or 3414.
If that doesn't work, you can move the distribution amp to the attic and remotely power it through the coax or install a preamp.