[Jake V]

Your antenna is aimed between 68 and 69 degrees and the list of "spotty" and "wish for" channels are all in that direction. That's useful.

Is the problem the same on all four televisions? You might list the cable run in feet from the antenna to the televisions. Sometimes I've seen a run from the roof to the basement to a splitter then with two leads back up to the second floor that resulted in loss of stations. Shortened runs oftentimes help.

The first thing I would try is to connect a direct line from the antenna to one television and see if you get all of your desired stations without break-up. If not, then splitting the signal is never going to make things better.

If you don't get all your stations with one television and this were me, I'd take a compass on the roof to check the exact pointing of the antenna. And then move it up and down the pole a few inches, and then left and right a hair at a time. Sometimes you find a sweet spot.

If you do get all of your stations with one television it would be useful to us to know what kind of channel master splitter you are using. Is it passive? Or does it amplify the signal? If you are feeding four televisions is it a four way splitter?

I can't determine the manufacturer and model of your antenna from the photo, but it probably has a gain of about 7-9 dBi. If the above does not work you might consider upgrading your antenna to something like an Antennas Direct DB-8e that has a gain of 17 dBi or the DB-8 that has gain of 15.8 dBi. I'd also add the VHF kit. There are also other manufacturers with similar products, though the published gains are a bit less.

Others will also post.