In my apartment, the GSM signal is very scarce, if not absent at all, except for a few spots, where there's a decent LTE signal and I can browse internet reliably.
In order to improve the reception across all my apartment, I'm thinking about buying a cheap low-noise RF Amplifier like this and put it in a corner where the LTE signal is decent.
It operates from 5 MHz to 6000MHz, which is fine because LTE works from about 400 to 3500 MHz.
It requires a 5 V input, which is the same voltage provided by USB. I can take a USB cable, cut it, and connect the power pins to the Amplifier.
I do not think I need an antenna: the LTE signal is decent enough in certain corners and my apartment is pretty small.
My question: would this setup work? Is there any potential problem that I have not thought about?
(The problem of low GSM signal is know in the building, and it will be addressed sooner or later. It's due to scarce coverage. I have no reasons to think that there are sources of interference.)