I have a double Yagi antenna setup that I used successfully in the past, with both antenna connected directly to a 4G mobile broadband WiFi router, achieving 50-80 Mbps. The antenna have different polarities, one vertical and one horizontal. This was the recommended setup for max performance and stability.
Now I have moved this setup to a remote cabin in the mountains, but with a new addition: a GSM remote starter for my kerosene furnace. This requires a splitter, ref picture. My question is how do I minimize loss of signal?
There are three parts to this: the splitter itself/the splitting of power between two devices and the unused terminals.
Will splitting the signal half the power hitting each device, as in "input signal power"/"number of devices"? I suspect the math/physics to be slightly more complex than this ...
I understand that every additional thing will decrease the power of the signal passing through, but I seem to recollect someone saying that it is wise to terminate the unused terminals, for some reason. How and how much (relatively or absolutely) will an unused and unterminated output affect the signal?