It's the same theory that applies in radio broadcasting. Radio signals propagate in 360 degrees on all axis', and the closer to the central point, the better the reception. For ideal coverage, you would center your broadcast station in the most central part of the attic, to provide the most coverage. The opposite is true too, wireless devices don't just receive, they broadcast back, so in order to do that, the receivers need the best connection. Line of site is best, of course, but not practical in modern houses, unless you run multiple receivers throughout the house.
In your case, the problem more directly lie in the splitter. Every single cable/Internet issue I have ever had in terms of connection, has lied in the fault of a splitter being used. If a line is being split between multiple duties, the capability of that line is reduced by the amount of times it is split, the only exception being fiber optic (it currently enjoys the highest rate of data transfer, so direct signal loss is negligible). Getting rid of that splitter will most likely solve a large portion of localized issues in your house. Connections outside your house, ie cable/Internet company transfer boxes, well, not much can be done about that.
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